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just another way to say you suck. When people are annoying you or getting you mad or even if you had plans to do things with someone and all of a sudden they cant, you respond with "You Blow".
Gosh you blow!

"Are we still going to the movies this weekend?" - boy
"No I can't. My mom won't let me out." - girl
"Damn you & your mom blow" - boy
by Tim-la March 10, 2008
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A brand of expensive wrist watch. Actually spelled Hublot, but the YouBlow spelling is more accurate, due to the legend-in-their-own-mind type of person who wears them.
I saw that rich kid wearing a YouBlow watch at the nightclub last night. Watch a pompous douche.
by Roidsboy April 21, 2018
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