FKAL is an acronym for "Fetching Kangaroo Anal Lubricant". It is often used by zookeepers, marsupial enthusiasts, and beastiality porn producers. It's defenition has also been recently expanded to mean any unknown acronym which one receives in a text message and has to be looked up on the internet.
Text conversation between two zookeepers:
"OMG the roos r starting to mate where the fuck r u?"
Josh: "Hey, do you have any idea what PDZ stands for? Julia just sent it to me."
Eric: "That's an FKAL, you'd better look it up on Urbandictionary."