Abstract: The snugger bugger slack adjuster is a handle comprising of two mating shell halves containing three parts. A plunger-button, a prong and a spring. The manually operable prong has two upward tines set at 45 degree angles. These tines are set in opposite directions so that when a line is in place, the tines will embed themselves deeply into the lines. When the plunger button is depressed, the prong will disappear into a chamber in the handle allowing the line to move freely. The release clamp is seated within in the handle halves such that the button extends upward through an aperture provided in the handle. When so seated, the spring bears against the underside of the prong, driving it upward which brings the line-engaging tines into contact with a portion of the line that passes through the handle. When so seated the line-engaging tines bear against the lines within the handle and they are unable to be advanced when the plunger-button and prong is in an unbiased position.