Fancy Mouse 

the act of ejaculating on a mouse ( fur color doesn't matter) and then teasing it till it runs into your lover's vagina/anus

John said, "I gave Susie the ole' Fancy Mouse last night."

Fancy Mouse by AlaskanThunderFuck April 18, 2010

fanny mouse 

a tampon.

"oh dear, i have my period, i should really stick a fanny mouse up there"

fanny mouse by amaree gilham December 24, 2003