When you are so into someone that you start panicking about the possibility of being separated from them in the near future. Often occurs on Sunday nights after spending an awesome weekend together. May cause fitfull sleep. Valid for both romances and bro/bramances.
Conductor: "Next stop is 14th St. Union Square"

Quick, kiss me inappropriately. I'm having separation anxiety-anxiety (SAA) about the fact that your stop is coming up.
by Mellencamp August 14, 2009
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