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2.
(A derivative of the word "mustache.") To have an inordinate amount of chest hair that only grows on the pectorals leaving the stomach area bare.
1. Bill took off his shirt off at the pool, only to reveal he had a chestache!

2. I had to get waxed because of my chestache.
by solman November 17, 2010
 
1.
(chěs'tāsh', chə-stāsh') -noun.

Chest hair on men, which is allowed to grow without shaving at the top of the chest (in any of various shapes), and shaved clean from well above the nipples down to the waistline.

A chestache allows a manly appearance in a partially unbuttoned shirt, but with a cleaner appearance below the chest whilst shirtless.
"I like his chestache, but it sure gives him a weird tan line."

"I love running my fingers through his chestache."

"His handlebar chestache is oddly appealing, but I wonder how much wax it takes to do that"
by Smart as Shat May 25, 2009