"Dasmn" is variation on "damn". It started as a typo by MyCowsCanFly in a chatroom. It is also a work around for silly bots that don't like the word "damn" or have no sense of humor. "Dasmn" is not to be confused with "dang" or "darn."
Dasmn, that's a good word!

Dasmn, you dropped that bowling ball on my foot!

"Dasmn the torpedos, full speed ahead."
by MyCowsCanFly August 23, 2006
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