Projectile vomit that is blown or driven through the air in the form of tiny drops during a crowded public event like a party. The vomit turns from a stream to a spray when the vomiting person tries to hold in the vomit with their hand. The hand cannot possibly hold back the chunks resulting in a highly pressurized spray of vomit. Party Sprays are not a good time and can result in shame, disgust, loss of relationships, ruined clothes and revocation of cover charges.
After paying $1200 for bottle service, he was thrown out of the club for party spraying off of the second floor balcony onto the crowd of girls on the dance floor. The unwitting girls mistaken the party spray for a mist machine.