[footfootfoot]

Didn't listen to the audio, so I can't say.

Ripped is an expression meaning muscularly toned (Linda Hamilton in Terminator)
Catnip is a drug that makes cats either very mellow and lovey or completely insane and frisky

Catnip mice are toys that cats rip to shreds in a frenzy of catnip euphoria

So I was saying that you should be as toned and muscular by now to the same extent that a catnip mouse would be ripped to pieces after two years.

I'm pretty sure there is a similar expression in Vietnamese. Almost certainly sure.