'To get hitched for half a monkey' is to do something or to have something done for a bargain (literally taken, it means to get married for just 250 pounds, which is dirt cheap)
What?! Fix your loo for 5 quid? Why do you always want to get hitched for half a monkey?!
A trip to a grocery store, convenience store, or gas station for the sole purpose of buying an excessive amount of junk food and sugary drinks, usually with friends. A chud run often happens late at night and ends with everyone involved hating themselves afterwards.