gawk

Etymology 1

From a variant of gowk, from Middle English gowke, goke, from Old Norse gaukr (“cuckoo”), from Proto-Germanic *gaukaz (“cuckoo”). Cognate with Danish gøg, Swedish gök, German Gauch, Old English ġēac. Compare also French gauche, and English gawky and gallock.

noun

1. A cuckoo.
2. A fool; a simpleton; a stupid or clumsy person.
   A Duke of Weissenfels, for instance; foolish old gawk, whom Wilhehnina Princess Royal recollects for his distracted notions, — which were well shaken out of him by Wilhelmina's Brother afterwards. 1855, Thomas Carlyle, The Prinzenraub, Westminster Review

Etymology 2

Perhaps from English dialectal gaw (“to stare; gawk”) + -k, as in talk, stalk, etc., ultimately from Old Norse gá (“to heed”).

verb

1. To stare or gape stupidly.
2. To stare conspicuously.
3. (colloquial, vulgar) To suck.