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When you're having sex and your partner yells "tunasub" before ejaculating and begins tickling you uncontrollably.
Yo man, me and my girl were having sex and right before I busted my nut she yelled "TUNASUB" then started ticking me. I swear man, she loves tunasubbing me more than she loves food.
by Dick pouncer December 10, 2016
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