To be so consumed by thirst for an alcoholic beverage that one is showing a biological response to quench said thirst, much as one might be gasping when short of breath.
Mathew was absolutely garsping for a pint on his arrival in Dublin.
The act of squeezing one or both of someones testicle(s) like a grape as a means of interrogation, or punishment. Popular amongst females and homosexuals.
Girlfriend: So where were you last night?
Boyfriend: Don't worry about it.
Girlfriend: *grabs balls*
Boyfriend: OMG STOP GRAPING ME!!!!