go ahead and

an annoying phrase bosses often use in attempt to soften a command to do something.

A girls way of daring you. Not permission. Don't do it!

Simply means "proceed". The connotation is that you have full permission, or are encouraged, to do whatever it is. The phrase is used in reference to any act, and usually in response to someone asking permission to do something.

To allow someone to move ahead of you, to signal that you let them go first, stating that it is time to leave.
A reversal of the proper english of 'go on ahead'. Its a southern thing.

When you totally fuck something up.
Fucking shit up beyond all recognition.
When you do or say something stupid.

Also go head

Pronounced "go-hed" or "go-hyead"

1. A command given as a compliment.
2. An exclamation used when macking, spiting game, or flirting to tell the person that you approve of what they are doing or how they are doing it. Also to let them know that their style is fresh and they should keep doing what they are doing.
3. Usually accompanied by the thing or person you are telling to go ahead or what you want them to go ahead with. Go ahead with that! Go ahead girl, or go ahead playa.
4. Another way to say "play on player" or "keep doin what your doin"
5. Typically proceeded by a whistle or a high pitched oooowie or skooo-hiee sound that one makes when they see a fine ass. "Skoo-hiee! Go ahead with that!" Or proceeded by a tsss sound you make with your tongue when you see a booty that your feelin'
6.

Made fresh by Brad G. from arlington/DC.

also see JUST GO

this is commonly used when a chick is done arguing and just wants you to shut up. this is not a green light, rather, a dare. should you go, it becomes on and is only a matter of time before she serves you back.