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A manly gathering of several bros at one bro's house, where bros tell each other secrets and bond like bros do. Slumbro parties can only occur during long weekends, but they are always the highlight of the week. Similar to a slumber party, but much manlier. Not to be confused with a sausage fest.
Mark: Slumbro party?

Jim: SLUMBRO PARTY!!!

Anthony: YEEEAAHHH!!

Mark, Jim, and Anthony high-five and have the time of their lives at Mark's house.

Tom: Mate, that Slumbro party last night was fucking PRECIPITATING!!
George: I know right?! We're totally having another one next weekend!
by Hot Tamale, I'm Sweating November 11, 2013
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