When one has a third breast (i.e. from a Chernobyl accident, a genetic mutation, an unusual hormonal issue, etc), one can be said to have a throob.
I once dated a woman with throobs. God I miss her...
When a girl is exposing her cleavage and there is a space in between her tits.
gerald: man did you see that bitch's throob?!
arnold: hell yeah i did! the perfect about of space for me to slide my meat pole through!
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