thumbhorn 

v: when a man uses his thumb to help ease his limp penis into a vagina -- this act is often performed while drunk and resembles the operation of a shoehorn fitting a foot into a shoe

I drank 37 beers last night and there was no chance I was going to get hard. I definitely had to thumbhorn the bitch.

thumbhorn by thebozak June 11, 2006

thumbfort 

To comfort with one's thumb, by means of rubbing

My girlfriend was sad so I grabbed her hand and thumbforted her until she felt better.

thumbfort by makijoy March 22, 2017

thumbwhore 

Someone who posts a comment on youtube only to get in the highest rated comments section

person 1 "*unoriginal comment about the number of dislikes for a video*"

Person 2 "Shut the fuck up thumbwhore"

thumbwhore by sexybacon September 22, 2010

tumborn 

Tumborn is actually made up of two combined words, tumblr + born. It basically means the date you created your own tumblr blog and started using it (the day you were born in tumblr). get it? :)

Girl 1: Hey, when were you tumborn? (means when did you create and started using tumblr)

Girl 2: Who, me? April 01, 2010!

tumborn by Gela Maniego, Philippines December 6, 2010

Thumbdowner 

Pathetic life form that systematically goes through Urban Dictionary´s "Word of the Day" list giving a thumbs down to every single definition without reading any of them. Out of spite and utter lack of creativity, finds more exciting to downgrade the work of others than to come up with even a run of the mill (conventional, mediocre, prevalent, regular, trite) idea.

Get a life Thumbdowner, life is short and then we die.

Thumbdowner by rperazag May 26, 2010

Thumbion 

A thumb with protruding knuckle that resembles a bunion on one's toe.

Wow - Angelina is beautiful but look at those thumbions!

Thumbion by Fulco June 8, 2009

rusty thumbone 

Similar to the rusty trombone, only performed when masturbating. You insert your own thumb into your rectum (left or right hand, your choice), bend your wanker down between your legs and crank your pecker between the four remaining fingers of the same hand and your palm. The beauty of this is that you have a free hand to eat a sandwich or work the TV remote.

Steve: "When I get Lisa good and tanked, she'll like my anus like there's no tomorrow, then she'll leave my house and go lick Tony's ass. She love's ass"

Ramone: "She's a whore, she didn't come over last night for her usual drunken booty-call so I had to give myself a rusty thumbone. I hear she was licking Matt's ass"

rusty thumbone by rileyriley March 3, 2011