Someone who has no muscles, or whose muscles are very squishy.
Feel my guns!
Wow, nice mushles...
nonmuscles. one having squishy, soft, easily bruisable flesh where firm healthy muscles are expected to be. often found on the lazy and incorrigibly lardy.
As the enormous english teacher sighed heavily when lifting the small book, the class went to pieces laughing at her jiggle-tastic thunder arms and mushles.