A 72 hour or more hooker, alcohol and blow extravaganza, sometimes ending in a hospital stay and/or death. Referencing the amazing behavior of the actor Charlie Sheen.
Oh, man, I was sheening like a total muthaf*^ker!
by Chef Mojo January 29, 2011
Fucking up while drunk, stoned or otherwise out of control due to intoxicants, uppers, downers or whatever'rs.
Dude, I really going for it tonight. If I start sheening please drag me out before I get my ass kicked or busted.
by Dan Quan March 8, 2011

...1. the act of raging wildly(with or without cocaine and porn stars)
2. the act of mentally converting your bi-polar disorder to bi-winning

3. winning at life
4. being a warlock
5. taking enough drugs to kill an elephant
*1. "Dude, I just blew a 7 gram rock. Straight up Sheening tonight!"

*3,4,5. "Did you see that kid last night? Fucker kicked like 12 cars, totally Sheening."
by Jack Sparkfist March 7, 2011
Projecting the image of taking charge of your life after obvious public blunders in offensive measures that others view as boisterous ranting and unnecessary ego stroking.
Harley realized that his career and family life was on the downslide and instead of owning up to his sloppy drunken staggering in front of his coworkers, he began Sheening on everyone...loudly explaining to everyone how important he was to the survival of the company and how they all owed him for their success.
by Exmortal March 10, 2011
1) Going 24-hours without doing a single thing right. The opposite of Reaganing, which is going 24-hours without making a single mistake.

2) Screwing up in the most spectacular way possible. Complete and utter self-destruction.

Named for Charlie Sheen, who has done both very publicly.
Dude, you were totally Sheening.
by UAllRedENo March 1, 2011
High,Stoned,Drunk,or just out of your mind
Dude I was totally Sheening last night!
by Houcky March 6, 2011