A brass instrument from the Renaissance and Baroque Eras; an the ancestor of the modern trombone.
Sackbuts (renaissance/baroque trombones) are often described as being generally quieter, having a more mellow tone and wider pallette of articulations than the modern trombone.
Person 1: "yo I heard moh finna beat up gaby after lunch for sleepin wit his girl"
Person 2: "bitch, pleasee moh all sack but no balls"
Person 1: "shiitttt true my g"