buttjack 

When a female or male fingers the asshole to a male and ejaculates the penis

You hear John gave Tom buttjack last night?

buttjack by babababrady September 4, 2006

Buttack 

To stick ones finger ,usually in the form of a sneak attack, in someone's ass crack when it is exposed above their pant/underwear line. While doing so scream "Buttack!!!"

As Emmett leaned over exposing his plumbers crack Jason exclaimed "Buttack!!" While sliding his pointer down his toosh.

Buttack by Toiletstains March 30, 2015

buttracker

A person who tracks or looks at butts they find attractive. May also be used as an insult.

Friend 1: Stop looking at those butts, you buttracker

buttracker by minhothesassking April 16, 2015

Buttpacker 

A play on words, connecting the words "backpacker" and "butt". Somebody enthusiastic about travel with a pinch of naughty to them.

Mainly a noun but can be used as an adjective.

- "Omg, that girl totally just flashed her tits from the top of the Eiffel Tower !"
- "Totally buttpacker"

- " We saw this funny penis shaped pile of rocks on our trip to Himalayas"
- " Must have been somebody from the buttpacker crew"

Buttpacker by Buttpacker June 20, 2018

vestigial buttsack 

When a person is born with the parts to form a butt (butt cheeks) but no flesh ever properly forms in it, so that the prson doesn't have the natural roundness of a butt and are therefore forced to sit on the extension of their thighs for lack of a natural butt. Or in simpler terms- lack of butt meat.

Hold on, is that Crystals's thighs or just her vestigial buttsack that's creeping from the top of her jeans when she bends over?

vestigial buttsack by Zoraya M May 19, 2008

Dickriding Buttjockey 

A gay man who enjoys hopping dicks.

Tom Cruise is a dickriding buttjockey

Dickriding Buttjockey by not found [Error 404] March 2, 2009

peeing your buttsack 

When someone has taken a pee and it has overflowed the buttsack.

Hey man, quit peeing your buttsack!

peeing your buttsack by The real mike jones November 14, 2014