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1.
When one uses the application Snapchat for sex-related purposes.
Yeah, I downloaded the snapchat app so I could snatchchat my boyfriend.

Damn, did you see the snatchchat that zoey sent out? What a hobag.
by isanythingnottaken January 10, 2013
 
2.
People sending crotch pictures on Snapchat
That girl uses Snapchat as Snatchchat she sends everyone nudes.
by ohheyitsannika August 18, 2014