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a party or get-together that consists of only family members in a 'jam' or party like setting.
Tonight, i'm heading over to Uncle Fred's for a famjam.
by Samantha B July 23, 2005
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1. to party with family

2. to miss going out going with friends because of stupid family events
guy 1: yooo did you did go to that party last night is was sick

guy 2: bro i was at a fam jam
by alexander pina and jlo July 10, 2008
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An orgy consisting of immediate family members.
Scotty,

We miss you. When you get back from the Marines me and your Father have a nice fam jam planned for you.
Your sisters said "Hey and they miss you."

Love,
Mom
by RANDYSANDYPANTIES February 06, 2011
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