Verb: Used by musicians when busking a lot in order to gain large amounts of money.
Megabusking is differentiated from normal busking by its intent: busking can be for the pleasure, while megabusking is solely for the money.
Megabusking can be used to pay off large debts, or to make up for large non-refundable payments.
Boy: Oh God, I've just paid a £1000 deposit to a grammar school I don't want to go to! What do I do?
Girl: We've got to get the money somehow... LET'S MEGABUSK!
I enjoy megabusking.