Costa Rican Phrases

I've been trying to Google and it's been failing me. My new partner is Costa Rican and I know some Spanish (he is practicing English with me and I'm practicing Spanish with him) but I'm curious on if there are any Costa Rica specific little cute flirty phrases. I know every country has their own differences and colloquialisms.

So far we've started calling each other guapo/a which I know is common in a lot of Spanish speaking circles.

But is there any cute little thing I can call him specific to his home region that I can surprise him with?