Slash hair: to get one's hair cut.

What we're talking about here is the result of a good old fashioned deep thrust. This is when the mans nest is mingling with the womans after a full insertion - and I mean to the hilt.

Hair on hair can happen with gay sex also.

Stuff that grows on people's balls, heads, arms, legs, and stuff that grows on cats, dogs, your anus, and so on.

A separate creature that happens to live on your head, hard to tame. Ferociously attacking it with scissors, dye or hairproducts may euthanize said beast for a short while but beware of angering it.

An extremely useful phrase that can be added to just about any statement to add emphasis of something nasty or strong.

Said emphasis may refer to, but not be limited to, the strength of a smell, the power of a punch or hit, poor taste or any other situation where accentuation of something nasty or rank is needed.

Pieces of fine yarn all over your body. You can theoretically knit with it, but if you knew where it came from, would you really?