When you have down syndrome, you have an extra 21st Chromosome. So by saying someone has an extra 21, you are essentially saying they are retarded, or have down syndrome.
You and Abby didn't do it last night? She was totally into you. Someone must have an extra 21.
The nonexistent size for an article of clothing which inept teachers name in a school-wide poll. This term is particularly popular among physics teachers that lack English as a second language (LESL).
A description indicating a state of surpassing mediocrity. A condition lacking simultaneously redeeming and detrimental qualities; thus, being remarkably mediocre.
1. The cheapest thing on the menu at most fast-food places. Homeless people come to a place that serves nachos with 40 cents, asking for just the extra cheese.
2. The absolute worst thing to buy and split with your girlfriend on a date.
3. A person that is cheap.
Cindy: Hey Marissa, where did Carlos take you on that date?
Marissa: Oh my god, he took me a movie theatre just to split extra cheese (2) with me!
Cindy: Wow, I never took Carlos for such an extra cheese (3).