When someone possess negative traits to such an
extreme that the person appears to exhibit the opposite positive trait.
Similar to how a
manatee is so ugly that it is perhaps the most beautiful
creature on Earth.
Guy 1: Dude, she's pretty cute.
Guy 2: What are you
talking about, she looks like a man, and not a good lookin'
one at that.
Guy 1: Oh... I guess you're right, the
manatee effect had me going there for a second.