Top Definition
An achievement of extreme success unparalleled by lesser men, esp. relating to sporting or academic pursuits. Typically a lachlanporteous will be performed by a man with many talents and many romantic conquests.
"George Gregan did a lachlanporteous for his captainship of the Wallabies."
"You did a lachlanporteous on her."
by ntfactor April 27, 2012
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