thumbin' it 

The act of rolling on the floor in your bathroom while thumbing your asshole. This excludes any time after you have received a blumpkin.

" I saw Devontae through his window thumbin' it yo."

thumbin' it by Harrison Stevens August 29, 2005

thumbing it in slack 

When a man fails to achieve an erection but is undaunted and proceeds to push his penis into the vagina or more commonly anus and attempts sloppy sex by pushing in his penis with his thumb.

Nathan - Aww man im going to jail. imma be some guys bitch. i hope they are tender and start by thumbing it in slack

thumbing it in slack by SGTKM December 1, 2010

thumbing it

A reference to hitch-hiking, where one puts out one's thumb in the thumbs up position in the hopes that a passing driver will stop and give a ride. Used when one does more walking than riding.

The car rental place was closed so we ended up thumbing it most the way.

thumbing it by patdurling July 31, 2016

thumbing it

placing ones thumb in a females butthole while in the doggy-style position

i was thumbing this one broad from montebello

thumbing it by dick starbuck March 30, 2004

Thumbing it in

Using your thumb to help pleasure a woman cause you can't get it up.

Mart had to much to drink and couldn’t get aroused. So he didn’t disappoint the lady he used his thumb to help get it up there (thumbing it in).

"Like trying to push a Marshmallow into a piggy bank."

"You’ve got it!"

Thumbing it in by scratch_nasty November 2, 2011

Thumbing it

thumbing it is where you And your pals are gaming all night

Mate me and Ike where thumbing it last night

Thumbing it by Alfiebear007 November 30, 2019

Thumbing it

The act of placing your thumb into your own anus, usually while masturbating

“I caught your dad thumbing it in a bus stop yesterday”

Thumbing it by Big swanno October 13, 2020