Greeting. See hello
y0 bitch, whats uP? y0! Nudding G. just chilling. y0 my h0mes
by Azul November 23, 2002
An initial value of y, pronounced "y not". Used to refer to the starting height of an object in Newtonian physics textbooks.
y = y0 - v0 t - 1/2 g t^2
by Mike September 16, 2006