The number that (usually) comes before three. Square root of four. Also the amount of people it takes to tango.

A twenty-two caliber pistol. Similar to fofo.

When a cigarette is shared and smoked equally by two persons.

n. The lonliest number since the number one.

Twos is a special word. While it can be used in relation to cigarettes, it makes more sense to apply it to joints.
It makes sense as a noun -
Adjective -
imperative -
verb
Basically the person who rolls it starts it - the person who has called 'twos' then gets it afterwards.

There is no threes or fours. It just flows from there.

Sharing a cigarette between two people

between 1 - 3

after one second