A description of when your urine and/or genitals stink (of course, especially after you've eaten asparagus, but these days used for any awful smell down there.)
A nickname given to someone who stinks like this. And we've all met them.
"Urgh, not tonight - unless you shower. You're too asparagussy,"
So, this friend of yours; is she someone I might date?
Asparagussy? Jeez, no!; Steer well clear of her - she stinks.