One who delights in slorping down slippery loads of jizz. Although this term carries a negative connotation when applied to macho males, it is considered a positive attribute in women and homosexual men.
I sucked and jacked his heavy cock until his balls exploded a clotted wad of jizz in my mouth---it tasted sour, but I swallowed it anyway. Then he patted my head and murmured, "You're one hell of a cum sucker."