What you say when you want to say that a specific mussel has some nice big muscles.
"Man, that mussel's got muscles! All those other mussels over there have no muscles at all, but this one does! Anyways, let's eat!"
A group of mussels that has some nice big muscles.
"Yo those mussels got muscles! Man those muscles are absolutely huge bro! Anyways, let's eat!"
When a group of mussels have very weak muscles so you decide to point it out.
Bro: Bro these mussels don't got muscles at all they are so weak man.
Mussels: You know we can hear you bro, right?
Bro: Well for starters I don't care and for seconds I'm gonna eat you anyways so time to dig in I guess!
Mussels: WAIT NO NO-