Top Definition
a person whose family has known your family for an extremely long time and whose history you know so well you might as well be related (even though you technically aren't).
Amy's parents grew up with her best friend Kate's parents, so Kate and Amy are pseudo-cousins.
by busrider May 16, 2007
1 more definition
5 Words related to pseudo-cousin
Your parent's best friend's kid that you are very close with and consider family.
Guy 1: I was hangin' with my cousin last night... well, my dad's friends' kid.

Guy 2: Oh, your pseudocousin?
by TheStig1214 July 08, 2012

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