Noun
Any small, insignificant lap-jumping dog that incessantly barks and yaps painfully loudly at absolutely nothing.
Stereotypical: Like most girls with bejeweled cell phone covers, she does nothing to stop her little puke of a lapyap from annoying everyone in her building.
Mathematical: All chihuahuas are lapyaps. All lapyaps should be suffocated. Therefore, all chihuahuas should be suffocated.
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.