Thumbutt 

The act of inserting one's thumb into another's butt.

The thumbutt, also known in it's original latin form, (thumbus buttus) is an ancient practice, dating back to the origins of mankind.

Yea, Jenny was being a total bitch so I just had to give her the ol' thumbutt.

Thumbutt by Dr.moopaloop June 7, 2011

Thumbuptomy 

The act of giving someone a "thumbs up" or one that gives theirself a thumbs up on a website.

No one was giving me a thumbs up on my report so I used the old thumbuptomy.

Thumbuptomy by Jamfetto April 6, 2009

thugbutt 

Shared anal enjoyment of a double ended dildo by two participants.

Hey baby, how about you and I enjoy some hot thugbutt tonight with my new toy?

thugbutt by Kinkmeister August 30, 2013

tumbutton 

The bellybutton. Can often be peened with fingers, peens, or phalic objects.

Stop peening my tumbutton.

Oh yeah, peen my tumbutton harder.

My tumbutton has lint in it.

tumbutton by Trihornasaurus April 18, 2005