To blurt is to say quickly whatever comes first into your head (Oxford English Dictionary).
During the play-off match to determine the third place finish at the Quidditch World Cup in 2014, the brooms of US teammates Darius Smackhammer and Lucas Piquery were locked together due to the flying skills of Japan's Seeker, Noriko Sato. It was not considered to be a foul because they were on the same team (QWC).
Lexicon list of Quidditch fouls
From the Web
WizardingWorld.com (Pottermore) features:
Screenshots of the Daily Prophet coverage of the 2014 Quidditch World Cup (originally from Pottermore), written by J.K. Rowling, and saved on Imgur:
- History of the Quidditch World Cup
- Quidditch World Cup 1990-2014
- Match reports and articles from the 2014 Quidditch World Cup
Harry Potter Wiki: Blurting