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From the acronym S.E.G. (shit eating grin). Used as an all-encompassing name for jocks, frat boys, bros, douche bags, ect., and refers to the cheesy smile the aforementioned often display, usually before date-rape, or climbing into a raised truck. Coined in Southern California in 2006.
John: Check out those dooshes in the trucker hats.

Sam: Yeah, those guys are total fucking segs.
Seg by Gil Brooks October 24, 2007
Related Words
"Look at that Jew suckin' a dick, what a Seg!"

"Man, Joe won't play Siege with us? That's such a Seg move!"
Seg by Rosenstein_Shekelberg March 31, 2020
Acronym for Sexually Educated Girl. The type of girl that has received a significant sexual education so that she avoid's all measures to avoid getting pregnant or catching an STD.
Dude 1: So shall we do it,

SEG: Yes, Do you have a condom? First I need to see the expiry date on your condom. Is it a Trojan or Durex, or Store brand? Where have you stored you condom, in dry warm conditions? Do you have lube? Is it water based or oil based? I think just to be sure, I better give you a blowjob with two condoms on.

Dude: Dayuuum girl, you a SEG!
SEG by TheMadFelcher April 18, 2010
Describing a fat persons protruding gut.
‘Wow look at the Seg on the bloke

‘That lady has a massive Seg’
Seg by Truv January 13, 2021
Short for segment, segamatron, seggie, segmeena and segatron (a variation on segamatron), a Seg is a creature of very small stature, likened to a hobbit, of JRR Tolkien fame. They feed on blackcurrant cordial and baked potatoes, and move around in a shuffling manner. They are extremely rare and have often had other animals, such as kia, the wife of the famous willow mistaken for them.
Fo shizzle segamatron, you is lookin supa-fly in eric 2day.
Seg by Pete November 17, 2003
To change course or part company at very short notice.
Dudes I gotta seg.
Seg by gabbars February 20, 2011