Very large, expansive, fat, impressive, muscular, intimidating, or important(adjective)
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Use "big-ass" in a sentence
"It is a big-ass house — but truth is, I rarely made an immediate exit."
"We've found movers, so I don't have to carry our big-ass refrigerator down 4 flights of stairs and up another 4, which is good."
"You think you've got the ball, and he throws his hip into you and his big-ass quads, and all of the sudden he's going the other way and you're like what the hell just happened?"