Top Definition
The stripe that is on the underside of the penis where it looks like the skin has been joined together.

If you check your own penis you will see it - and as it has no official medical term, and has appearance the of a seam weld, this is commonly referred to as 'The Weld'.
Look at ' (The) weld' on that cock
by Les of Lesbania November 12, 2010

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