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1 definition by Tony Belviso, Aaron Duke, Joseph Bledsoe

 
1.
In the bases metaphor for hooking up with women... Tagging up is when you are at one base (such as 1st base, makingout) and you move to go for the next base (2nd- grabbing boob)... and you get denied by the girl. You then return to your original base and await for your next opportunity.
I was hooking up with Emma this weekend and i went for second and got denyed but luckily i was able to tag up.