The name given to "Watchmen" character Dr. Manhattan's Penis.
"HOLY SHIT! Look at the size of Lower Manhattan."
by Verin1337 October 02, 2009
Pull down your pants and take a dump between the couch cushions, then put the cushions back in place.
That nasty bitch came over to my house last night and did a lower Manhattan!
by B-Rad 69 October 25, 2011