Casey Anthony Hits Up Happy Hour at Famous Dive Bar in West Palm

Casey Anthony and a female friend hit up a famous dive bar in North Palm Beach, and the trail went cold ... as in ice cold beer.

The infamous former defendant and her pal arrived for happy hour at the Brass Ring Pub ... renowned for its burgers and well-chilled brews.

We don't know Casey's BFF's name, but they seem tight. It looks like the same woman she was with at an anti-Trump rally back in February.

Anthony lives in the area -- about 30 minutes from the BRP. If she's smart -- which is questionable -- she's a regular.

Seriously, the burger reviews are off the charts.