Occasional slang for testicles. I can't believe I don't see this definition here yet. There are so many terms for a guy's nuts, and this is just another. If someone refers to a guy's grapes, you know what they mean.
"He has to have huge grapes to have even attempted that stunt.
A competition where women see how many male genitalia they can pop in 30seconds
The world record is 89!
Boy: The international grape popping competition is on on Friday and you going to go
Girl: No last time I got juice all over me
When a deal or bet is made, and one of the parties involved backs out and does not pay up or welshers on the deal
You lost the bet and didn't pay up, now I have to go the store and buy you some welshers grape juice
A person with a big heart. If you know someone who uses this username you are really lucky, they are a great friend and will always accept you, cherish you and care for you like family.