What to buy a male bestfriend for his 21st?

A bottle of vodka. He'll forget that he's even an adult. :p

Booze.

PC games or PS4/xbox games...

get him a conspiracy theory documentary so he can achieve on more year alive and open his eyes to the things our world governments hide from us

Edit: Also a poster of Dick Cheney's face photoshopped onto a really buff dude. I know I'd want that

Here are some options:
1. A wallet
2. Cufflinks
3. Perfume/ body spray
4. A nice shirt

Don't by him anything - he just wants some becky, and that costs nothing.

A gift card or an electronic ..or just condons to **** you.