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1.
Extremely physically toned; have or having abnormally deep ridges delineating individual muscles and/or insane muscle definition due to exceptionally low body fat.

Usually the result of an individuals obsession with vanity and subsequent over-exercising and maintenance of an outrageously-low-fat, and possibly unhealthy, diet.
"Mike exercises soo much, dude, and all he eats are salads and kebabs. Is he crazy?"

"No, son. He just wants to be chiselicious for the summer."
by the chiseled one March 26, 2008