Do you get the jest of it?

I think you may mean lime zest. In cooking, the "zest" of a citrus fruit is the outer, colourful portion of the fruit's skin. Some citrus fruits which can be "zested" include oranges, lemons, and yes...

to be joking, playing around or tricking someone- think jester

Jest is a prank or an joke.It can also be an act. Jest is also a smart remark made by someone. (when joking around.)

The Pantech Jest is a cell phone that has just came out and it is from Verizon! hope i helped! (:

Because she didn't want to embarrass him for telling a lie in public, Martha asked him, "Surely you jest."