look up any word, like donkey punch:
 
1.
When someone drops a deuce on the beach
WILLY! you did not just sand hammer under that chicks towel, did you?
by Big Nation March 27, 2003
 
2.
The act of burying your dick in the sand after getting aroused on a nude beach.
Dude why the hell are you still laying there? We gotta go!

Dude... I gotta sand hammer right now.
by GuidoTexan October 18, 2010