That frikken crazy kid from The Shining says this

Redrum is a kind of animal that doesn't ejaculate very often because of its extraordinary bad smell. It is often seen in the jungle and at WDK (World Domination Kronhjort).

1. alchohol
2. the famous kid on socomcodes, some people hate him, some people love him. his username is r3drum_inc
3. from a movie

the act of slashing one's own hand (i.e., with a hunting knife. broken beer bottle, or any other appropriate device), then using that hand to jerk off (if you're a guy). Particularly good for cutters, this way you're killing two birds with one stone. For girls, see redrum stabby.

(for women), the act of slashing one's own hand and/or fingers with a broken mirror, old razor blade, box cutter or similar device, then using that hand to masturbate. The bloody fingers or cutting implement are used to "stab" into any erogenous zone. Similar to redrum slappy.

A person who talks with a lot of vocal fry because they're trying to make their voice sound lower than it is. Common among millennials. Term is a reference to the child in the shining saying redrum using vocal fry before he starts yelling it.