The act of shouting, at a festival, so it gets passed from person to person until it attracts the attention of the desired person. Example: Bert: Wheres Ryan? Ernie: Dunno, use the festival-phone. 'Ryan!','RYYYYYYAAAAAANNNNN!'
FESTIVAL-PHONE
Meaning of FESTIVAL-PHONE in English
Slang English vocab. Английский сленговый словарь. 2012