What is 20-teen?
One of the excessive 20-somethings year olds in the porn industry that are somehow considered 'teens' even though they are quite clearly much older than 18/19.
Man looking at porn with other guy 1:
Woah dude, that teen looks like she's taken quite a few cocks!
Guy looking at porn with other man 2:
Nah man, that's no suprise. Y'see she's a 20-teen