Description applied to someone - male or female - with a less than pleasing physiognomy.
Look, I'd like to fuck you but you're as ugly as a bag full of chisels.
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To go at full speed or full drive; show intense earnestness; to use great force; to go off brilliantly.
Full chisel is also a type of chain for a chain saw that has square-cornered teeth which is the most aggressive when cutting and cuts the fastest.
I'm going full chisel studying for finals this week.