Slubbing \Slub"bing\, a. & n. from Slub.

Slubbing billy, or Slubbing machine, the machine by which slubs are formed.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Slub \Slub\, n. [Etymol. uncertain.]

A roll of wool slightly twisted; a rove; -- called also slubbing.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Slub \Slub\, v. t. [imp. & p. p. Slubbed; p. pr. & vb. n. Slubbing.]

To draw out and twist slightly; -- said of slivers of wool.

Source: Webster's Revised Unabridged Dictionary (1913)