Pupils get an earful in my class if I hear them using the word 'gay' to mean 'rubbish' (largely because it would be horrible for any gay kids on the class to have that always in the background).
Today I overheard some kids getting around this:
'Dude, stop being such a vegan'
'Oh man, I have maths next. That is sooo vegan'
Much better, no?

