A dorky guy trying to be cool on the internet by talking smack to people for random thrills. This person is usually found annoying by everyone. He could be playing an internet game, leaving rude youtube comments, or spamming lameness upon social networking sites.
by MJwins June 23, 2010
When you're hitting it from behind and your slap her ass, to which she responds by yelling "just stick a thumb in it!"
by Captain Hazelwood May 20, 2021
by Biggaybear April 2, 2013
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
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
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