1. In the throws of passion with a young lady, if one has performed sufficiently then they would notice two characteristics; firstly an epileptic fit like attack, then secondly a vaginal secretion. This secretion makes a crusty stain on the bed - hence the phrase 'mingstain'.
2. A smelly bastard.
"Look at that dirty mingstain u left on my sheets love, now get down them stairs and wash em u slag!" (Obviously a slightly harsh reaction putting the young lady under duress after her overwhelming experience)
"You fkn mingstain"
by Raydon December 23, 2003
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