fathead

a fuckin dumbass who basically thinks they're the shit and know everything

Person 1: Yo bro, is that a card?
Person 2: Yeah man! It's free cash!
P1: How? Let me see that.. this is a credit card, you owe them money.
P2: I bought 50 MacBooks though.. I thought it was free money
P1: No you fucking fathead.