Top Definition
A Jyline is an extremely well defined jaw line, common in handsome people, celebrities, and rich west coast private school attendees.
"Holy cow that Tom Cruise has a stunning jyline!"

"Once I realized I had a jyline, I quit my day job and started banging hot babes all day long!"

"Sarah, get a load of that hot Jyline! I want it in me!"
by ScottBott December 30, 2008
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