Bup
bup definition by Slang.net
This page explains what the abbreviation "bup" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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A "bup" is a plan you make in case your first plan goes awry. For example, a bup comes in handy when a key ingredient for your homemade dessert is unavailable.
You will most likely see bup when messaging online or texting when something goes wrong. Some instances where you need a bup include when your gf breaks up with you, your car breaks down, the hotel loses your reservation, or you get fired from your job.