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Is to send a text message after already sending a first text message and not receiving a reply, usually to a member of the opposite sex that one is interested in. The double tap is often a rookie mistake that everyone makes in their life and it usually comes off reeking of desperation (which in turn puts of the recipient of the text even more).
Person A -"Why hasn't she replied yet.... Stuff it im going to send her another text."
Person B - "Dude.. NEVER try double tapping.. thats instant desperate weirdo!!"
by Ruddaga August 31, 2009