A phrase meaning that as long as the girl or boy has begun growing pubic hair (grass on the field), then they are an acceptable person to have sex with (plays)- regardless of age.
Dude, your sister is looking hot lately!
Asshole! She's 10!
Hey, grass on the field plays.
You're sick man...
A Shackteau is a humble, weather-beaten, structurally questionable shelter located in a spectacular or highly coveted place—Wales, Jackson Hole, Sun Valley, Crested Butte, coastal Maine, the Alps—where the building itself may be worth almost nothing, but the dirt, view, access, and mythology make it absurdly valuable.
In use:
Shackteâu - We thought it was an abandoned shed until the realtor called it a rare alpine Shackteâu with unobstructed views and listed it for $2 million.