If you're near Terminal 21 ( meet up central ) and need a quick bite to eat, here's a good tip I discovered this afternoon - the fifth floor of the next door mall has a large, cheap food court that gets some pretty good reviews.
Just went there and grabbed a large soup with pork as a snack - very flavourful, super cheap and very quick.
Be aware you have to exchange money for " food court tokens" before you can buy stuff, but it's a pretty easy process.
Not sure which one you mean, but the terminal21 food court itself (also on 5th floor) is the best in town IMO.
it's cheap as all hell... 1 dollar meals... been eating there for the last week pretty much, actually some of the best food I've had.
and just in case u didn't know, if u don't use the credit u put on the card u can always get a refund for unused cash
If anyone knows a place where they serve great Pad Thai, please post here! I'll be in Bangkok near Terminal 21 in 26 hours and am looking forward to some good Pad Thai 
Conaissance - yep, that's the one I mean. Damn good.
And rather easier to understand than Chinatown.
I went for a wander there last night. Ate some great food, but I have no goddamn idea what it was 
Sunrise taco's across the road, 24/7 we been 2 nights in a row haha shishas are 300 baht too
Sunrise Tacos is Bangkok IM community's meeting place central 
Food court in Terminal 21 with the swipe card is beyond cheap and tasty
Was there yesterday. Best and cheapest food so far.
I'm hoping todays brunch is extra delicious