An energy weapon used on the TV show Stargate SG1. It resembles a cobra ansd fires a lightning bolt. One hit from a zat will stun you. Another shortly after will kill. One more and you're vaporized.

the way foreigners pronounce the word "that"

short for "is that"

dutch slang in belgium meaning drunk

acne on your butt.
zits+ass=zats

Someone you don't really have anything against, but you hit for the fun of it anyway.

zat is a common expression used to express amazement in some Bangladeshi social networking site. Just as lol.