look up any word, like fap:
 
1.
A woman that has been screwed so many times, that it wouldn't gain you any respect or self-dignity to have sexual intercourse with her. Hence the word "tap". She is liked tapped water.So in that case, she has been filtered.
"Dude! Don't do it with Ashley. She's been filtered!"
by SierraWithoutTheMist April 20, 2009
 
2.
Substitute word for something sexual when you're telling your sister about a dream the night before and you catch yourself.
"He filtered inside my jeans this morning"
"You were NOT filtering inside my jeans!"
by emx1 November 11, 2011
 
3.
To be deleted from someones facebook.
Heather "filtered" her "friends" from facebook.
by It's Billy Silly January 04, 2009