1. a traditional English dish of breaded fish fingers and chips (fries) wrapped in newspaper
2. A phrase synonymous with "What an idiot". Comes from situations in which someone does something so unfathomably stupid that the only logical explanation for their actions is that they have fish and chips for brains.
1. Oh man, mum made fish and chips last night, it was so tasty!
Dudebro: Hey, hold my beer and watch this!
Sensible Person: No. You're just gonna hurt yourself doing something stupid.
Dudebro: Nah, come on!
*Dudebro attempts to jump a ledge on his skateboard and ends up landing balls-first on a railing*
Sensible person: Fish and chips...