Cul-de-sac

A word in French that you always see in books but no one knows what it actually means.

*Reading* 'Mary found herself in the cul-de-sac'
Me, a middle aged smart boy: 'HAH, the cul-de-sac. I totally know what that means. Sweet.'

AIDS

Anything bad is aids

'Hey man have you played against that new raid boos'
'Bro I had like 15 tries it's so AIDS'