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1.
When a guy or girl is getting anal, the third person is trying to weasel in and lick the butthole of the guy or the girl that is getting fucked.
Wow dude, Phil totally cheek weaseled me while I was getting anal last night...
by RRohypnol December 02, 2012
 
2.
one who scurries between cheeks to enter the anal cavity; will colbert; other pussies
Will should go to jail, he'd fit right in with all the other cheekweasels.
by Smartest man alive March 21, 2007