Describes someone or something that is plump or chubby with a firm, fleshy feel; often with a slightly voluptuous nuance (onomatopoeic/mimetic).
彼女はむっちりとした頬が可愛いと言われた。
People said her chubby cheeks were cute.
むっちりとした体つきのモデルが新しい広告に起用された。
A model with a curvy, plump figure was chosen for the new advertisement.
彼の指先はむっちりしていて、紙をめくるたびに弾力を感じる。
His fingertips are plump, and you can feel their springiness each time he flips a page.
むっちりとした唇に口紅がよく映えている。
Lipstick looks good on her full, plump lips.