ガシッと
gashi' to

Adverb
Suru Verb

1. firmly; solidly; heartily

Onomatopoeia
Related to がっしり
かれはボディビルが趣味 しゅみというだけあって からだがガシッとしている。
karewa bodibiruga shumito iudake atte karadaga gashitto shite iru.
Bodybuilding is his hobby so he has a very firm tight body with lots of muscle definition.
Other forms: