A word (usually an insult) used to describe somebody as being silly/a fool, etc. It can also be used as more of a loving/joking insult, meant for close friends, if you are that way inclined.
For example: You forgot to buy me a doughnut?! You're such a mooseface!
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.