(slang) To make a mistake.
If I go near a skateboard, I'm sure I'm just going to goof up and fall off.
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(transitive, slang) To introduce problems to or damage through incompetence.
I tried to fix it, but I think I just goofed it up some more.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.