If somebody (typically a girl) dates and/or has sex (this includes all variations) with a person that attends the same class, they jessy them.

A Jessier usually tends to date one classmate after the other and is known for moving on quickly after a break-up.

The process of dumping a guy for the wrong reasons and getting together with another one after a short while is also referred to as "pulling a Jessy on sb."
"Yo! Did you hear what Jessy just pulled?"
"Yeah, I heard she's dating this other dude from her class."
"Exactly, she's totally jessying him!" -> to jessy sb.
by jessier January 31, 2012
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