Hipster slang for Stand Up Paddleboard, and not just hipster slang for "What's up?"
Oh, look at me, I'm so cool. I SUP. I can stand up on a piece of wood in the water and go places.
Street Slang Meanin' What's Up?, Whazz Up?, Whazzup?, Wassup?, Sup Witchu?, Sup Witcha?, What's Good?, What's Gucci?, What's Goin' On?, What's Happenin'?, What's Hanninan?, How Are You Doin'?, How Yew Doin'?, How Are You?, How Yew?, How Are You Feelin'?, How Yew Feelin'?, What's Trendin'?, What's New With You?, What's New With Yew?, What's New Witchu? & What's New Witcha?
"Yo Cam'Ron!! Sup? Zilch. Erstreet At Ever Soo Much At Ever Str8 Thuggin', Ever Str8 Stuntin' & Ever Livin' Life Fully." - Erstreet Harlem aka Harlem, Flea, Kiery Weiry & Freshley.