lmayonnaise Posted in L Best definition lmayonnaise as in LMAO but made into the food. witty way of saying LMAO on msn. Beth: honestly it was so funny! Rosa: arrrr LMAYONNAISE! How satisfied are you with the definition? Looking for lmayonnaise meaning? Delighted that you discovered the greatest determine on our web site! Recently this definition was actually observed 30 times.