Acronym for "short sleeve button-up." Used in a variety of fashions, most commonly for vacations, blue collar jobs or for a lack of better taste.

The SSBU is often worn in environments where class is non-existant and is often accompanied by its cousins, the jort or the cargo pants. SSBUs are often found in Hawaiian print or with the name of the individual patched over the chest. SSBUs are never appropriate for business attire and should never be tucked in or worn with a tie.
Ross was reprimanded this morning for wearing an SSBU to a board meeting.
by pwnnoobs September 20, 2010
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It's been so long since he's ejaculated, he's suffering from S.S.B.U.!
by Henro July 08, 2005
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ssbu stands for super smash bros ultimate which is a fighting game made by Nintendo which is the fifth game in the franchise and is only playable on the Nintendo Switch, all fighters are from their own games, ex. Wolf is from the StarFox series, etc. the franchise is extremely popular and highly rated, if you have the chance definitely play the game as you have a "blast".
hey wanna play some ssbu


by Wolf O' Donnell February 21, 2019
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Originally an abbreviation for Super Smash Brothers for Wii U. Now more often used as an abbreviation for Super Smash Brothers Ultimate.
SSBU? You mean, like, 4, or Ult?
by Aqxer January 09, 2019
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