In the game of chess, En Pisant is the action of a pice moving 2 or more squares next to a pawn. the pawn "jumps" in front of the piece and the piece is then captured.
a pawn moves two spaces forward 2 spaces next to a pawn, the pawnit moved next to may be captured, if desired. This is the action of En Pisant.
Poitant is another term for satisfying; graceful and delectable. A term used to express contentment of a noun, or anything in general that pleases one in a relaxed manner, though usually it's used to describe aesthetics.