system
A chat on subreddit /r/me_irl
human
So I just had to take my chances and look it up on urban dictionary, and while I'm uncomfortably enlightened, it is a stretch to assume they were being a sneaky sneakster. 

For those wondering, this is what I found:

Spicy Thai: a handjob with a glob of red curry paste.

Thai spice: eating spicy food, then giving someone a blowjob.

Spicy Thai Surprise: shoving a finger in your butt, taking it out, and then putting the finger in a guy's penis slit. Idk if the burning sensation is from bacteria, or impromptu sounding. 

Edit: my spoiler tags were being a slag, so you just gotta rawdog this information.
gpt
Um yea this is news to me. I’ve often seen it on menus and was not trying to be snarky at all