Clam jumper
A manwhore. Guy that jumps from clam to clam.
Did you guys hear about Dave? He slept with Amber, Jenny and Jennifer, he's such a clam jumper.
Clam Jumper
A guy who sleeps with all his female friends...male equivalent of a "homie hopper"
Dude, your such a clam jumper! You've slept with almost every girl we know!
clam jumper
Similar to "cock blocking". When a female prevents another female from making a male connection.
Lisa was about to get some sexy horizontal action until that clam jumper Betty showed up.