assrunning 

In an wordFPS game, killing an enemy player from behind, often after some following. Since the enemy does not know about the threat and thus becames an easy prey. Considered as lame behavior.

Stop assrunning and start to play, wordnoob!

assrunning by Clockmaster June 5, 2003

assburning 

When you eat any sort of spicy food and your asshole erupts into flame.

Dude I had a totally assburning experience at taco johns

assburning by Carlos the dinglefart November 19, 2015

asslunking 

(v.) Deep exploration of ones anal cavity.

One night I decided to take Karen and go asslunking in the hopes that I find her secret hidden treasure spot.

asslunking by Elliot Persinger November 18, 2007