The white gluey stuff you used to use in 'arts and crafts' at primary school. No good for sniffing, very good for sticking bog roll tubes onto washing-up liquid bottles (remember to empty them first and get your mum's permission, not your dad's, it has to be your mum's). Probably not still available, like free milk at breaktime and golden nuggets.
teacher: let's make a spaceship by sticking all this rubbish together with marvin medium.
pupil: let's humour the silly cow.
other pupils: like we have a choice.