Definitions by Moontruther

Gruk 

Lame, as in not cool; same as Shrek is drek only it's Gru (despicable me) is gruk (used to insult the fictional character Gru)

Person 1: Shrek is drek, man.
Person 2: No, Gru is gruk.

Gruk by Moontruther November 27, 2017