"Luck of the Irish my ass, I just blew a tranny and an engine in my truck both in the same week... Boy it really ruined my day when they found out about each other."
Truck Troubles
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Explain Bear
Listen here, you absolute donut. First off, "tranny" is slang for a truck's transmission, and "blew" means it broke, you simpleton. Also, that "engine" is the thing under the hood that makes the wheels go round. The joke is that the user is using the double entendre for the word "tranny," as it is also a derogatory term for a transgender person, so when he says they "found out about each other" it makes it seem like his transmission and engine were having an affair of some sort. It's funny because it's unexpected and kinda dumb.