When you shove your entire head into a girls open vagina, all the way to the neck.
"Dude how was that bitch last night?"
"Fuck yeah shit was bomb she let me go full head!"
by Matthew Alex October 21, 2011
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In basketball, when a player has high speed and momentum. Usually used to describe large players driving to the goal for a dunk.

Originates from confused basketball announcers mixing up their words when trying to describe a player as moving “full steam ahead” before entering common usage.

Sometimes described as simply a “head of steam”.
Giannis is tearing down the court with a full head of steam!

Not many people are going to be willing to take a charge when LeBron gets a head of steam toward the goal.
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Phrase. To be seriously, dangerously and hilariously drunk.

Not location-specific; out with friends, on a date, at work - nowhere is safe from one of the lads getting a full head of steam up and running riot.

Interchangeable with;
- Massive Head Of Steam Up
- Fully Steamed

Superlative;
- World Record Head Of Steam Up
- Hey, did you see Ross last night?

- OMG yeah, he had a full head of steam up - I think he got arrested!
- What for?
- Everything...
by J.Manstrong December 27, 2016
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Phrase. To be seriously, dangerously and hilariously drunk.

Not location-specific; out with friends, on a date, at work - nowhere is safe from one of the lads getting a full head of steam up and running riot.

Interchangeable with;
- Massive Head Of Steam Up
- Fully Steamed

Superlative;
- World Record Head Of Steam Up
- Hey, did you see Ross last night?

- OMG yeah, he had a full head of steam up - I think he got arrested!
- What for?
- Everything...
by J.Manstrong December 27, 2016
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You are very intoxicated from a very large quantity of marijuana.
"On a hippie trail head full of zombie,"
-Men at work
by Locoweed415 November 2, 2013
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Having a head full of lettuce - to be extremely stoned.
"Dale, you can't smoke up before you shift!"

"It's cool, nothing makes me enjoy physical labor more than head full of lettuce."
by comeonbabylightmyfire April 9, 2013
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Crazy. Full of issues or other baggage.
Dude, I'd hit that if she didn't have a head full of snakes.
by AdamWozniak September 6, 2007
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