Hitchhike

To 'hitchhike' means to travel via car with people you don't know. To do it, you stand on the side of the road and hold out your thumb. When someone stops, you get in. Of course, this can be extremely dangerous, but it is cheap.

Example:
-I can't believe your sister actually hitchhiked!
-Yeah, she could have gotten kidnapped or worse!

Tightwad

A 'tightwad' is a person who likes to hold on to their money and not spend it. The term is not a compliment, but is pejorative, and the person is often considered to be 'cheap.'

Example:
-My favorite kids' store is Gymboree. Where do you get your girls' clothes?
-I love Gymboree, too, but my husband is a total tightwad.

Road trip

A 'road trip' is a trip in a car often taken by young people to get to a vacation in another city, such as a trip taken during Spring Break. Sometimes the trip itself can also be the vacation. Road trips often involve squeezing as many people as possible into a car, driving as long as absolutely possible (even all night), eating at cheap restaurants and staying in cheap hotels.

Example:
-I think we should go to Daytona for Spring Break.
-Road trip! I'm in!