A massive penis. Schlong dong can refer to the owner of the monstrosity too.
"I hurt a girl with my schlong dong last night, made that bitch bleed"
"Ash is schlong dong, thats why Shelly loves him."
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug