What is 13 Year Old?
When someone becomes a teen. 13 year olds think they're amazing, but instead they have raging hormones and their face is covered with zits:
1. a young teen
13 year olds like to hump each other and inanimate objects because they think it's not masturbating, but it really is.
13 year old Girl: OMG!!1 l@st n1t3 waz S0 keWl m3 @n my FR3ndz gOt 2G3th3R an HuMp3d 3@ch oth3rz bra1nz out!!1