The inability to stop smiling because of someone you are romantically interested in/involved with. Both men and women suffer from Girlface regardless of whether they are interested in a man or woman.
A: Why are you smiling?
B: No reason...
A: You have girlface! Why do you have girlface? Who's giving you girlface
B: <evasive> Um...
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.