Definition of "numps"

These are villainous engines indeed; but take heart, Numps! here is not a word of the stocks; and you need never stand in awe of any more honourable correction.

1673, Samuel Parker, A Reproof to the Rehearsal Transprosed‎

"You're a dizzard!" I retorted. "And a noodle and a jolt-head; you're a jobbernowl and a doodle, a maundering mooncalf and a blockheaded numps, a gaby and a loon; you're a Hatter!" I shrieked the last epithet.

1902, John Kendrick Bangs, chapter 10, in Olympian Nights