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-To be in an excited mental and physical state.
-Often times in reference to a boisterous and disorderly conduct often denoted with a straight raised arm that is slapped.
Peter: Ready to go downtown tonight Paul?
Paul: Yeah dude, SEFT!

Peter: Did you see those FINE Dallas Cowboys cheerleaders?
Paul: SEFT!!!!!
Seft by Kosmeekh January 16, 2009
Related Words
Sefton Seft Sefte sefter Seftermath Sefton's Law seftost sefty Seftyx
When a cold breeze blows on your dick
Damn that seft gave me chills.
seft by joe doveer March 10, 2023
When you slap someone at the back of the head once they have a haircut.
Nick got a haircut so I gave him a sefte
Sefte by BRADLEYBOY123 February 20, 2017

Sefton's Law 

Sefton’s Law states that the likelihood of mainstream adoption of new innovations is inversely proportionate to the extent to which using said innovation makes the user look like a dick.

Coined by Adam Sefton, Executive Creative Director at Reading Room
Google Glass is Sefton's Law in action. That wearers are already being called "glassholes" shows you that it'll never go mainstream.
Sefton's Law by SomeRoomie May 7, 2014
1. V. To mentally castrate for the purpose of enjoyment.

2. V. To destroy the mind and soul with unnecessary application of useless utilities. (i.e. calculus)
My calculus teacher decided to Sefton all of us with a mind blowing problem that even he could not solve.
Sefton by Seftonman December 2, 2009
last night i was seftering myself.
sefter by k-dog19 October 20, 2009