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Related to buttload: boatload
rude slang A lot; an abundance (of something). I'm sorry, I can't go—I've got a buttload of homework tonight.
mod. a lot; a large amount. (Usually objectionable.) I know we can sell a buttload of these recordings—if we can only get a shipment of them in time. I’ve got a shitload of problems and no idea how to work through them.