Green’s Dictionary of Slang

welt n.

[dial. welter, something large or heavy of its type]

(Scot.) the penis.

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[Scot]I. Welsh Glue 74: Ye ant tae huv seen this boot. Fuckin hell. N the size ay the welt oan the boy thit wis giein her the message.
[Scot](con. 1980s) I. Welsh Skagboys 42: —Big laddie but, Mel, Les says suggestively. —Tiny wee fuckin welt oan it but, she scoffs.
[Scot]I. Welsh Decent Ride 40: When yuv goat a welt like mine it kin take ages tae git one ay they things [i.e. a condom] roond it.