The hangover you get from smoking a lot of weed. It could be used about waking up the next morning and still being high. But if you smoke during the day time it can also be used about the feeling of beeing a little helpless and a little high some hours after.
Eirik: Man, I feel so sorry for all the poor kids on the TV. You know dude; we should be real greatful we grew up the way we did, with all the love and food we needed.
Henrik: I´m sorry, what did you say? I was playing snake at my mobile phone. Guess I`m still tummelumsk.
Eirik: I can`t remember what it was. Guess im a little tummelumsk to...