A descriptive term for an expensive vehicle owned by a man, said by a woman who has a pussy so big you could fit a car in it.
Woman:(sarcastic) Hey, nice penis extension you've got there!
Man: STFU and spread your legs so I can park, it's starting to rain!
n. Colloquialism referring to the Hummer H2 SUV. It is an established fact that feelings of inadequacy contribute to the purchasing, driving, and flaunting of one's Hummer.
Brad W., a 24-year-old jock who has trouble charming the ladies with his drunken partying, got his dad to buy him a brand-new yellow and chrome penis extension from the local GM dealer. Way to go Brad.