One who is sexually aroused by or attracted to, or engages in sexual activity with, a geriatric senior citizen (person older than 65 years).
"He frequently visits the old retirement home center to score with the elderly; I had no idea he was a geriphile, I thought it he was visiting for charity."
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.