I do this myself quite a bit, and i don't think it falls under anything other than being funny. Sure, you're telling people you're a lazy ass mofo, but if you do that with enough confidence - like you are perfectly aware and you can change any day you'd like - they'll see it as you having a sense of humour. Thinking of that as a DLV is not right in my eyes. Spin it!
As a side note: I have "changed", but I still go with the "I'm lazy" stories, which they see as me exaggerating things which they themselves (I know they are, they tell me, just not with confidence or humour, just as facts) are much worse at (and they know it). But exaggerating it makes it funny, so in their eyes, you're funny and better than them.