The imaginary level your beverage must be down to before it will float safely in a pool. The more bouyant the cup, the higher the float line. This line is not definite though, depending on waves in the pool one may need to drink more or kick their kids out
Once Steve noticed his floating chair didn't have cup holders, he quickly chugged his beer down to the float line so he didn't have to hold it.
by booyahbd November 22, 2009