look up any word, like the eiffel tower:
 
1.
The use of the armpit for sex.

See paraphilia
Axillism is a bizarre sexual practice.
by Mistercity August 06, 2006
 
2.
Having sexual Intercourse with an Armpit
her pussy is so hairy i can't tell if a am doing axillism or the real thing!
by Don Gulliver May 08, 2003