What does USPS mean?
United States Postal Service
Other definitions of USPS:
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How to use the term USPS:
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More slang terms:
Lame a** Stupid b***h
In the case of Super Smash brothers (a video game where famous Nintendo charaters duke it out). Your mains are your charaters your used to playing as, Thou most people only have one main charater per Smash game.