Simply, "Giant Ass Kicking Robot." Can be used in reference to any number of things, from the film "The Iron Giant" to the popular masterpiece of Japanese animation, "Voltron." Pronounced "gacker."
stands for “oh my god, Sebastian Stan, man you lookin, good you ever see a guy this handsome walking the streets he’s gonna get arrested because he’s killing all the ladies, look at thet, pow pow pow pow pow”
you look so good today ”o.m.g.s.s.m.y.l.g.y.e.s.a.g.t.h.w.t.s.g.g.a.b.h.k.a.t.l.l.a.t.p.p.p.p.p.”