diff --git a/Makefile b/Makefile
index 6fe628fe4..b68bbed0d 100644
--- a/Makefile
+++ b/Makefile
@@ -213,6 +213,7 @@ J_C_OFILES=\
        jets/c/met.o \
        jets/c/mix.o \
        jets/c/mug.o \
+       jets/c/muk.o \
        jets/c/peg.o \
        jets/c/po.o  \
        jets/c/pow.o \
diff --git a/include/jets/q.h b/include/jets/q.h
index 65c7d260f..58067710b 100644
--- a/include/jets/q.h
+++ b/include/jets/q.h
@@ -59,6 +59,7 @@
     u3_noun u3qc_mas(u3_atom);
     u3_noun u3qc_met(u3_atom, u3_atom);
     u3_noun u3qc_mix(u3_atom, u3_atom);
+    u3_noun u3qc_muk(u3_atom, u3_atom, u3_atom);
     u3_noun u3qc_peg(u3_atom, u3_atom);
     u3_noun u3qc_pow(u3_atom, u3_atom);
     u3_noun u3qc_rap(u3_atom, u3_noun);
diff --git a/include/jets/w.h b/include/jets/w.h
index 7457ef84f..57a5af06a 100644
--- a/include/jets/w.h
+++ b/include/jets/w.h
@@ -59,6 +59,7 @@
     u3_noun u3wc_met(u3_noun);
     u3_noun u3wc_mix(u3_noun);
     u3_noun u3wc_mug(u3_noun);
+    u3_noun u3wc_muk(u3_noun);
     u3_noun u3wc_peg(u3_noun);
     u3_noun u3wc_pow(u3_noun);
     u3_noun u3wc_rap(u3_noun);
diff --git a/jets/c/muk.c b/jets/c/muk.c
new file mode 100644
index 000000000..60e0a6b41
--- /dev/null
+++ b/jets/c/muk.c
@@ -0,0 +1,54 @@
+/* j/c/muk.c
+**
+*/
+#include "all.h"
+#include <MurmurHash3.h>
+
+/* functions
+*/
+  u3_noun
+  u3qc_muk(u3_atom seed,
+           u3_atom len,
+           u3_atom key)
+  {
+    c3_w seed_w;
+    c3_w len_w;
+    c3_y *key_y;
+    c3_w out_w;
+
+    c3_assert(u3r_met(5, seed) <= 1);
+    c3_assert(u3r_met(0, len)  <= 31);
+    c3_assert(u3r_met(3, key)  <= len);
+
+    seed_w = u3r_word(0, seed);
+    len_w  = u3r_word(0, len);
+    if (len_w > 0) { /* can't u3a_calloc 0 bytes */
+      key_y  = u3a_calloc(sizeof(c3_y), len);
+    } else {
+      key_y = 0;
+    }
+    u3r_bytes(0, len, key_y, key);
+
+    MurmurHash3_x86_32(key_y, len, seed_w, &out_w);
+
+    u3a_free(key_y);
+    return u3i_words(1, &out_w);
+  }
+
+  u3_noun
+  u3wc_muk(u3_noun cor)
+  {
+    u3_noun seed, len, key;
+
+    if ( (c3n == u3r_mean(cor, u3x_sam_2, &seed,
+                               u3x_sam_6, &len,
+                               u3x_sam_7, &key, 0)) ||
+         (c3n == u3ud(seed)) ||
+         (c3n == u3ud(len))  ||
+         (c3n == u3ud(key))  )
+    {
+      return u3m_bail(c3__exit);
+    } else {
+      return u3qc_muk(seed, len, key);
+    }
+  }
diff --git a/jets/tree.c b/jets/tree.c
index 2c23ccd8c..bffbf3883 100644
--- a/jets/tree.c
+++ b/jets/tree.c
@@ -54,6 +54,7 @@ static u3j_harm _mood__hoon_mas_a[] = {{".2", u3wc_mas, c3y}, {}};
 static u3j_harm _mood__hoon_met_a[] = {{".2", u3wc_met, c3y}, {}};
 static u3j_harm _mood__hoon_mix_a[] = {{".2", u3wc_mix, c3y}, {}};
 static u3j_harm _mood__hoon_mug_a[] = {{".2", u3wc_mug, c3y}, {}};
+static u3j_harm _mood__hoon_muk_a[] = {{".2", u3wc_muk, c3y}, {}};
 static u3j_harm _mood__hoon_peg_a[] = {{".2", u3wc_peg, c3y}, {}};
 static u3j_harm _mood__hoon_pow_a[] = {{".2", u3wc_pow, c3y}, {}};
 static u3j_harm _mood__hoon_rap_a[] = {{".2", u3wc_rap, c3y}, {}};
@@ -464,6 +465,7 @@ static u3j_core _mood__hoon_d[] =
     { "met", _mood__hoon_met_a },
     { "mix", _mood__hoon_mix_a },
     { "mug", _mood__hoon_mug_a },
+    { "muk", _mood__hoon_muk_a },
     { "peg", _mood__hoon_peg_a },
     { "pow", _mood__hoon_pow_a },
     { "rap", _mood__hoon_rap_a },