Mainly done at birthday parties, The act of one going to a party for a short moment and only singing happy birthday and eating, then soon leaving casually.
Person 2 : I thought we were gonna hangout
Person 1 : Ill be back soon I'm just gonna S.E.G.
Sam: Yeah, those guys are total fucking segs.
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!