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1.
An obnoxious alter ego involving douchebagness. "The Jeff" always refers to himself in third person and loves to talk about only the following things; gym, protein bars, working out, hair gel, his love of the show "Friends", fighting, degrading women. The female version of "The Jeff" is "The Rach". Similar to a douchebag but not constantly.
That guy turns into "The Jeff" when his friends show up, total doucheness.
by Loki Lullaby September 12, 2009
 
2.
When the woman cums all over her man's bald head.
Terry just gave her husband The Jeff.
by Thats_funny69 December 12, 2010