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When the whole squad agrees that something is great.
Mike: Did you see that booty?
Peter: That shits famtastic!
by Grian5000 May 22, 2016
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When you talk about your fam and how fantastic they are.
Fam #1- I can't wait to hang out.
Fam #2- Whenever we hang out, it's famtastic.
by taddy_paddy September 25, 2016
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