When you shove your entire head into a girls open vagina, all the way to the neck.

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

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”.

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

Crazy. Full of issues or other baggage.

You are very intoxicated from a very large quantity of marijuana.

Having a head full of lettuce - to be extremely stoned.