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1. noun. Def: Resulting burn from a particularly unpleasant hot smash, which depending upon the hot smash, could leave you ailing for hours.

The burn part of smashburn is usually related to but distinctly different from resulting burn from the runs or the squirts.
Lex: "Guys, I had a curry last night after drinking too much."
Guys: "Ah, that sucks, you'll be smashing all day."

Lex: "I just had one, and I've got smashburn."
Guys: "Maybe you should put some ointment on it."
by King Sexy November 07, 2005
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