ear humping 

when the penis is inserted or projected (whichever your preference)into the ear in a sexual manner.

when all other cavities have been covered (including nose) in a sexual manner, this is an alternative.

ear humping by Lisa January 13, 2004

ear humping 

When clare boyle licks an ear in a strange way

'let me lick your ear!
No
haha just did

ear humping by J.A Magnier April 18, 2005