Like oh no, but when you say it so fast that it blends together. Typically used when reacting to horrifying or disappointing events.

1) A response to a negative situation which is insignificant, or at worst, a temporay inconvenience.

2) A response to a negative situation occurs on a regular basis, to the point where it is expected.

Used when something that happens that is the worstest thing that could ever happen, seemingly.

An exclamation of horror and shock, negatively looking at an outcome.

Exclamation of displeasure

When you're too lazy to put a space between oh and no

Something you say when the FBI or the police are at your door, and they are after your LUNIX.

Casual use can be caused by a combination of displeasement and fear for Microsoft lawsuits against open source operating systems, such as Redhate Lunix. It may include other, less important things.