If it's swimmin put a lemon. Share definition Flag A restaurant phrase used when a garnish or lemon is placed with a dish that has some sort of fish. Cook: "Order up!" Server: "Thanks dude."Cook: "Hey man, If it's swimmin put a lemon." If it's swimmin put a lemon. by hey miss! September 30, 2009 0 0 Get merch Get the If it's swimmin put a lemon. mug. Buy Now — $32.95 See more merch