'Hypnotico' was produced by RedOne and as you can imagine it's not exactly unlistenable or short on catchiness.
We particularly like the line "we're silly heartbreakers tonight" in the chorus. Plus, at one point Lopez coos that she's "hungry for some yum yum", by which we think she means these.
As previously reported, the two didn't work together face to face, but Lopez had always been a fan of Gaga's lyrics and melodies. (ie It was some old shit RedOne had knocking around.)
You can hear 'Hypnotico' here.
(It is not shit.)