underwear; briefs; panties

The Martha & The Muffins song off the _This Is The Ice Age_ album from the early 1980's entitled "Boy Without Filters" might have been the genesis of the term. Also one needs to include the image and function of cigarette filters and coffee filters.

What they're filtering is left up to the user: gas, sweaty ball odor, snatch stench, overpowering sexual passion, etc.

a place where all of the shit collects

something used to seperate unwanted materials from wanted materials. the unwanted materials stick with the filter.

when a motorcyclist rides down the middle of multilane traffic when it is stopped. Is very enjoyable to do in early morning peak hour traffic, much to the frustration of angry car drivers (especially asshole 4wders). When filtering through moving traffic, it is called lane-splitting. Filtering is far less dangerous.

When a girl is giving a boy oral sexual intercourse, the boy finishes in her mouth. However, after this takes place, the boy will then take a straw and suck the semen from her mouth. From there, he spits it back into her face as she screams, "filter me!"

To pull down your pants and fart, removing the filtering provided by clothing.

When something(person, situation, story) is essentially made to, or even edited to seem not as bad as it is. Extremely similar to being fake.

A guy thinks your cute because you have a picture of you with a filter on

when a guy only cares about your looks and only likes you because you have a filter