also: むっきむき
na-adjective, noun which may take the genitive case particle 'no', adverb
Colloquial mimetic word describing a well-built, muscular body. Often used in casual conversation or manga.
彼は毎日ジムに通って、ムキムキの体になった。
He goes to the gym every day and got a muscular body.
そのレスラーはムキムキで強そうだ。
That wrestler is brawny and looks strong.