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1.
To be related to another girl through a third party's saliva.
Steff: OMG! I totally made out with that guy last night!
You: So did I!
Steff: We are saliva sisters now
by a.a.c.c. June 29, 2010
 
2.
A trio of irreverent female singers performing in SLC, UT
Did you see that Saliva Sister squat onstage?
by gaymormon June 04, 2011