costco

a person who is like family but not blood related, someone who you are so close with you basically are family, a family friend.. it saves alot of time instead of having to explain that your not really realated but just very close

your moms best freind from high school you see every weekend is like your costco aunt or if you have someone you see alot around your age but your not that close they are your costco cousin you would say "this weekend im going to me my costco cousin" instead of "this weekend im going to visit this girl whos like my cousin but not really were just very close"

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