1. A social event, increasingly popular amongst women in their mid to late twenties. Two or more women of the lesbian orientation will simultaneously and continuously ram into each other at top speeds resulting in serious injury.
2. An exclamatory phrase, usually shortened to just: "clam jam!" used in situations of extreme euphoria or frustration; rare cases of both at the same time.
" EF'ING CLAM JAM!!!!"
"what's wrong with sheila?"
"she's recovering from this weekend's Lesbian Clam Jam