I hear kids and adults use this phrase a lot. For example, when they are describing how they felt when they went to a certain place or function, they will say "When I go there, I very boring lah..."

If the word "boring" is used, this is actually describing the person themselves as not interesting, ie "I am a boring person". What he or she is trying to say is "I was bored." Boring describes how you are; bored describes how you feel about a place or event.

So you need to watch how this word is used - you don't want people to think you're not very interesting!