C.O.G.-n. short for Cool Old Guy. originating from Ireland. A guy working at a community college who hangs out with awesome chicks that gives free hugs.
That guy is a total C.O.G.!
chuckle or giggle. used to describe awkward laughter when something is weird or amusing but really not that funny.
dude did you know your junk is hanging out in your profile picture? oops. . . c.o.g.