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1.
Similar to a "Lady Boner". The female equivalent to a man crush. Similar to a "hard on".
Pronounced vaj-on
Lady 1 "Did you see Rebecca's shoes today?"

Lady 2 "I know! I've got such a ""Vag on"" for her style"
by Yosimite Potter December 21, 2011
 
2.
the womans version of a hard-on
he is so hot...i just got a vag-on
by cinnamon and peaches February 07, 2006