TJ: Oh hey~
Mel: Hey, what's up?
TJ: Oh nothing, you know. Just hanging~
Ash: omg, stop using the damn ~ after every sentence.
Mel: What's up with her?
TJ: Oh nothing, she's just a twiddle stick.
To twiddle your diddle stick means to masturbate, but your penis is very thin, and almost like a stick, but you don't have any lubrication, so you have to smack it back and forth with one hand, as if you're twiddling it.