A long moustache that hangs over the upper lip, tending to catch stray food particles as they travel into the mouth.
In the film Born on the Fourth of July, Tom Cruise sported a soup strainer throughout the scenes set in Mexico.
by Go4baroque1969 October 24, 2006
A man's mustache.
Oh, I see you've grown a soup strainer.
by Spinroyd March 06, 2014