A man who cannot restrain the urge to copulate with every human female he sees. Derived from gash, crude slang for female genitalia; and hound, a suffix commonly used to denote baseness, relentless pursuit and traditional male faults. (cf. pussy hound, hound dog, hound, bird dog)
"There goes Carcetti, chasing after another girl."
"Once a gash hound, always a gash hound."