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1.
To partipate in the online roleplaying game - Threshold RPG (usually NOT while having sex)
To Thresh, Threshing, to be a Thresher.
The usage of the capital T is essential to define a true Thresher
by Anon July 04, 2004
 
2.
Sexual intercourse
He needs a good threshing
by Betty February 11, 2004