When you light one cigarette off another cigarette.

when you are smoking a cigarette and you light the second cigarette with the first.

To light your cigarette (smoke) from another persons cigarette - usually from a close friend or family member. This is only carried out when a lighter is not immediately available.

Attempting to fuck while wearing clothes.

A sexual position involving a large woman and two five gallon buckets. The woman assumes a position where her asshole is pointed so that the best angle to fuck her is straight down, at which point you climb upon the two buckets and then proceed to fuck her in a vertical motion with your penis at a dick bending 180 degree angle. Most importantly you must then smack her ass cheeks with both hands with every successive thrust, giving you the appearance of a monkey hopping up and down with flailing arms. NOises are optional, but always appreciated

When you have a thought, then something totally ridiculous happens, and you COMPLETELY loose that thought. You were just monkey fucked.

when a cigarette is lit from another cigarette by putting the lit cigarette to the non-lit one and inhaling the non-lit cigarette