While playing the giver in the "doggy style" sex position, insert your thumb into the rectum of the reciever.
by The Cryomancer May 20, 2021
When you insert your thumb into a Connecticut girls ass while hittin it from behind. Giving you leverage for more thrust.
by Phat56Pat January 27, 2023
keeping a tad bit of cum/semean in between your pointer finger and thumb to wipe on someone/something later in day
“bro i wiped a thumb slug on brad after he called me a dick today”
“dave mad fun of me yesterday so i’m going to cum thumb slug him today”
“dave mad fun of me yesterday so i’m going to cum thumb slug him today”
by D the P slayer August 19, 2021
by Thisisntmyrsalname1 September 17, 2022
When you are hitting it from behind and have your thumb in her butt at the same time. Thumb-butting it.
by Blibicer November 26, 2017