Top definition
Any female fan who is obsessed with the band Mindless Self Indulgence or MSI. Msi sluts can be any age, but are always female. They can sometimes have an obsession with Jimmy Urine or other band members too. But don't worry most are just into the music.
Some girls online are such MSI sluts.
by You_don't_need_therapy June 14, 2010
Get the mug
Get a MSI slut mug for your dad Jerry.