It's a compound word, motherfucker!
"You're a stupid-ass motherfucker."
"...also, that shirt makes you look like a motherfucker."
"...so, fucking yeah man, I told that motherfucker to go fuck himself."
"...also, that shirt makes you look like a motherfucker."
"...so, fucking yeah man, I told that motherfucker to go fuck himself."
by El Terrible March 02, 2009