Definitions by DRDMH

Umbilingus 

Oral sex of the belly button.

My girlfriend was performing umbilingus but she stopped when she got a piece of lint in her mouth.

Umbilingus by DRDMH May 1, 2010

working off

whacking or jerking off to the point of aerobic exercise.

I'm all sweaty because I just spent an hour working off.

working off by DRDMH January 13, 2009