A boobstand is generally defined as the female lies on top of the male, while he is holding the female's shoulders with his hands, and he tittyfucks the female.
Mike: Dude, I totally gave this chick a boobstand last night. It was quite enjoyable.
A girl who has big breasts and uses them lies them onto of a short male friend or kid due to stiff shoulders
Cases like these would probably be in anime....
Boy- "MOVE YOUR BREASTS YOU OLD HAG I'M NOT YOUR BOOBSTAND"
Girl- "Old Hag I'm not even 20 now stay still brat
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.