HAFP
S(he) Ain't Fuckin' Playin', used when someone is so serious about something they might actually pee their pants from stress.
Bro, you’re literally sweating through your shirt, HAFP, man!
She canceled her plans for the whole weekend just to beat you at chess, HAFP!
He said he’d die if he didn’t get that promotion, HAFP, plain and simple.