Whats The best thing to eat after a night of drinking to avoid a hangover?!

EGGS! Eggs contain cysteine, lecithin and B vitamins. There's a reason all night breakfast places are full of drunken party people 'round midnight... Eggs fix hangovers!

Fluids are important too... An electrolyte/sports drink would be best, like Gatorade.

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First the best thing isn't eating, it's fluid, water, it's the main cause of hangovers. On eating, something wholesome and solid, like meat, eating in general will slow the absorption rate of alcohol, and help get your blood sugar rebalanced. Stay away from sweets, junk food and spicy stuff.

drink lots of water as much as you can, before, during drinking and after, that works

Water is the best.