A contraction of "What the fuck?". Can be used in polite conversation. Also appropriate to use when conversing with one's parents or co-workers or members of the clergy. "Whuck" is considered to be a complete sentence on its own. "Whuck" can denote a state of confusion, surprise, anger, or dis-belief.
"No, really son, Palin has some great ideas for turning the country around."
"Whuck? You're shitting me, right?"
Mechanical term. To apply excessive force or leverage to an object, often in an ill-advised way.
Use a longer wrench and a cheater bar and just hoark on that rusty nut until it breaks free.