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backwards tuna sub 

Tuna sub backwards is "bus a nut". Men use backwards tuna sub when they're too ashamed to admit during sex that they're going to climax much quicker than they had previously thought.
Johnny: "Oh no! I'm about to backwards tuna sub!"

Jenny: "It's only been five minutes! Pull out now, you loser!"

vertical tuna sub 

Man, I had a vertical tuna sub last night. Delicious!

foreskin submarine is pulling into tuna town for a three night stay 

When I get home tonite, my wife will be orgasmic when the ol' forekin submarine pulls into tuna town for an extended stay.

Subway Tuna 

I got really drunk last night, and I got me some subway tuna.
Subway Tuna by Naimoli45 February 15, 2021
Tunasub was created by some filthy minds on the twitterverse as an allusion to masturbation. Backwards it spells bus a nut. Used as an incognito way to announce that one has or has the intentions of masturbating.
After a long day, I like to come home, shower and tunasub.
Tunasub by Annastasia Beaverhausen November 1, 2011

Tunasubbing 

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.
Tunasubbing by Dick pouncer December 10, 2016