An exclamation used when you screw up bad or break something. Often yelled as you run away.
Usually, written with punctuation like "Glue! I need glue!" and with lots of exclamation marks.
The proper response is "You're going to need lots of glue!" just before you throttle the person for breaking your stuff.
If you are lucky it belonged to someone else and you can say "I told you so."
For a full explanation see Humphrey Hambone.