Bluegrass is a perk unlocked from the beginning of Tower of Guns.
"Triple Jump from the start!"
Bluegrass gives you two additional jumps from the very beginning. This perk is very versitile, as jumping is a very important mechanic in this game. The triple jump makes finding early game secrets much easier, as well as allow one a greater degree of dodging enemy bullets. Loadouts with guns like Egon's Pride or the 609mm Hand Cannon will benefit greatly in terms of mobility, allowing them to get extra milage out of each and every jump.