semsible

Semi sensible.
1. Sensible, generally, but with the capacity /inclination to not take things too seriously

2. Sensible, but still observing the absurdity of existence

"Have fun at the rave" said Dave's Mum, "be sensible "

"..I'll be semsible" said Dave, cheekily, knowing full well that he was actually going to get well munted.