is someone who prefers to plumb mens holes with his own wrench and nuts.
if a man goes in his toilet and finds theres either a blockage/leak or hes just a bit of a gaylord if you get my meaning then he'll call round his schvincter plumber to fix it for him with his big tool.
a regular fun boy whos reliable, on time and does his job to a high standard of gayness when you require him to and then goes away.
"oh great... i just had that hole fixed last week, it might need to be 'broke in' again to get it running smoothly"
"tut, my pipe is a bit chafed down there, i'll need to call my schvincter plumber to release the blockage" etc