The Sassage Flare is used by Jake to signal BMO to make sausages in "Little Dude." He keeps it inside his body and can stretch it out using his Stretchy Powers. Finn reminds Jake that Lady told him not to use it. He tells Jake not to abuse it, because he thinks Jake is getting fat.
It is a black flare gun with a red rim on the barrel. It fires a green flare that explodes in the air to spell the word "SASSAGE." The signal's appearance and function are similar to the Hot Dog Knights' B.U.T.T. signal's from "The Limit."