Today's slang : いけてる(=iketeru) adj. anything cool, nice, delicious, funny, attractive..
Negative form : いけてない(=iketenai) Not cool, bad, not funny, dull

From pic. 「私、今日いけてるでしょ！」(=Watashi kyou iketeru desho!) Don't you think I am so cool today?

Ex. 「この店いけてるよね。」(=Kono mise iketeru yone) This restaurant/ bar is not bad! (Cool!)
Ex.「 マギーのカレシ、いけてるね。」(=Maggie no kareshi iketeru yone.) Maggie's boyfriend is cool! (or cute!)
Ex. いけてない芸人 (=Iketenai geinin) A bad comedian. A comedian who is not funny at all.