NODDLE

noddle

(noun) an informal British expression for head or mind; “use your noddle”

Source: WordNet® 3.1

Etymology 1

Noun

noddle (plural noddles)

(UK, informal) The head; the part of the body of an animal or human which contains the brain, mouth and main sense organs.

(UK, informal) The head as the seat of mental capacity or intellect.

(obsolete) The back of the head; nape.

Verb

noddle (third-person singular simple present noddles, present participle noddling, simple past and past participle noddled)

(intransitive) To nod repeatedly.

Etymology 2

Verb

noddle (third-person singular simple present noddles, present participle noddling, simple past and past participle noddled)

Alternative form of noodle (“improvise musically”).

Source: Wiktionary

Nod"dle, n. Etym: [OE. nodil, nodle; perh. fr. nod, because the head is the nodding part of the body, or perh. akin to E. knot; cf. Prov. E. nod the nape of the neck.]

1. The head; -- used jocosely or contemptuously. Come, master, I have a project in my noddle. L'Estrange.

2. The back part of the head or neck. [Obs.] For occasion ... turneth a bald noddle, after she hath presented her locks in front, and no hold taken. Bacon.

Source: Webster’s Unabridged Dictionary 1913 Edition