drinking... driving.. spinning out into a curb at speed wrecking your Z...

another word for Million dollars. Based on the character Millhouse on the Simpsons.

Excellent. Superlative. Top notch. Used to express delight, satisfaction, victory, or pleasant surprise.

This comes from an episode of "The Simpsons" in which the geeky and unpopular character Milhouse enjoys a small number of fortunate happenings, such as finding Ten Dollars. In response to the lucky occurrence, he exclaims "Everything's coming up Milhouse!" The total expression is reduced to "Millhouse" for convenience. Millhouse is a misspelling of Milhouse.

A Simpsons character being a young boy with glasses.

The state of being intoxicated to the point where one looses all motor functions and coherence.

To 'do' a 'Millhouse' is an action; similar in execution to that of feltching small rodents - except that this is usually done by someone small, bespeckled and with a fiesty attitude. Beware - someone caught 'doing-a-Millhouse' is likely to become very aggressive when confronted. Best turn a blind eye and walk away slowly - covering and holding firmly one's own crotch area.

When a romantically-linked couple could easily pass for brother and sister.

An individual who chooses to date someone who shares their physical characters is worthy of ridicule as they are presumably guilty of narcissism (at best) or incest (at worst).

Can work as well for homosexual couples who bear a familial resemblance, prompting assumptions that they are brother and brother, or sister and sister.

Origin: From the Simpsons, Bart's long-suffering sidekick Millhouse Van Houten has similar blue hair, thick eye brows, and large glasses as both his mother and father. Additionally, it is possible given Millhouse's poor judgement that his parents do in fact share the same genealogy.

From "The Simpsons: Season 22, episode 3 entitled: MoneyBart (2010)
Bart has provoked his noted-feminist sister Lisa with dismissive terms such as "Honey Pie" and "Tootsie Pop". Prompting Nelson to interject with the following:

Nelson Muntz: Hey, get a room, you two.
Lisa Simpson: We're brother and sister.
Milhouse Van Houten: So are my parents ... I think.

"pulling a millhouse" / "to pull a millhouse"
suddenly leaving the internet/IRC and staying out for some time.

if you are a regular on and you leave without dropping a note, you successfully pulled a millhouse.

A horrible deal that even an idiot could understand is not worth the risk. It's also a well known card from Hearthstone that gives the opponent the ability to play all the spells in their hand for free.