Top Definition
1.) A boy or a girl who is an expert in sexting and finger talking.

2.) Someone who is extremely adept in using his or her thumb to have a full conversation on cell phone. These people are able to enjoy every action vicariously through cell phone chatting and text messaging. They hold the cell phone in such a way that their thumb (of the holding hand) can reach every button of the cell phone without any difficulty.
Jason can provide us upto date results of the NHL game through his blackberry sitting inside the rink. He is a thumbactionist !

Julia recently joined twitter and became a thumbactionist after meeting other single twitterers..
by Shazz Spazz (Vancouver, BC) September 04, 2009

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