Used when some idiot is trying to be funny. It started when 2 morons were playing a game in which they say a word, then the other would say a different word, and make a sentence.
Ryan: Once
Tucker: Upon
Ryan: A
Tucker: Meatball
Ryan: Sub
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When your balls get caked in period blood while fucking a girl
dude i totaly got a meatball sub from my girl last night!
A Meatball Sub is when you stick your cock and balls into a hamburger bun and shove it into your partners mouth.
Yesterday I gave my wife a meatball sub and she bit too hard.
When Two Men Simultaneously Put Their Nuts Inbetween a BBL. Meatball Sub.
Hey Rachel! I Heard Chris And Vince Gave You A Meatball Sub!
When you bust in the pussy and drop your nuts inside the vag and the cum oozes out the mudflaps.
"Did you smash that girl?"
"Yea I gave her an inside out meatball sub"