In everquest (and other games) it means out of mana.

It’s an acronym standing for Can’t Remember A Fucking Thing. It’s usually used to describe embarrassment at being unable to remember someone (CRAFT moment); going onstage as the lead in the latest theatrical performance and your mind goes completely blank (CRAFT situation); the next morning after a night when you got pissed as a fart and woke up in bed cuddling a traffic cone and a string of fairy lights wound round your prick.

Out of Mana (while playing World of Warcraft)

what a dsylexic cow says

A word/sound made to express feelings in response to a remark or photo that is possibly 'sexy' or purposefully unsexy (and therefore funny).
Most popular on the Internet.
Derives from the word 'ooh' and sounds like 'boom'. What more could you want?

dyslexic cows go 'oom'.

To have finished your drink, but still require more. Most often used in the bar scene.