doable age gap

The "doable age gap" defines the age gap between two teenagers, in which having sexual intercourse with each other is morally acceptable. It is usually defined as 4 years of difference, so an 18 year old guy having a sexual relationship with a 14 year old girl would be out of bounds.

Shes 14 and hes 17 but thats still in the doable age gap.

the cosmo

Doing the cosmo refers a teenager guy having sexual intercourse with a girl, thats 4 or more years younger than him, thus exceeding the doable age gap.

"Did you hear Dom(18) banged a 14 year old? He did the cosmo."