1. when you have physical pain because of a physical burn
2.when a person loses a roasting battle and gets butthurt

made from the roots "caust-" meaning "burn" and "alg" meaning "pain".
1. the after effect of the third degree burn gave Ryan loads of caustalgo
2. Derek: " man, they dropped that roast on you like a nuke."

Ryan: " yeah, got just as much caustalgo like the time I got that third degree burn."
by Den of Cats February 19, 2019
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