hot stripe 

A thick brown stripe on toilet paper that appears following six or seven clean wipes that induces frustration of the wiper having been under the assumption that his asshole was already clean.

Melvin: What took you so long in the bathroom?

Dennis: I got a hot stripe, so it took longer, dammit!

hot stripe by ambr0gi0 February 16, 2010

Strike while the iron is hot 

Act quickly while the opportunity is still available. Blacksmiths working iron by hand heat the iron in a fire to red-hot making it malleable. The Smith removes the iron from the fire and shapes it with blows from a hammer. They need to work quickly before the iron cools. Once the iron is cool, it becomes brittle and the opportunity to hammer it into shape has passed.

If you want the job, you need to strike while the iron is hot.

Strike while the iron is hot by Chicago God April 11, 2005

strike while the goose is hot 

To seize the moment of opportunity just as it is fresh from the oven. This is when the goose is most vulnerable, as it has just been killed and cooked. That is when you should strike.

You know, you just gotta strike while the goose is hot.
Don't wait man, strike while the goose is hot.
If you don't strike while the goose is hot, I will.

strike while the goose is hot by The Hunterman September 15, 2011