Top Definition
Bassist in the cool pop/rock band Twenty Twenty. He was born on the 21st of May 1990 to parents Jane and Stuart Halliday. He has an older brother Sam, and two younger siblings Joe and Lydia. He is in the band Twenty Twenty with his brother, guitarist Sam Halliday and drummer Sonny Watson-Lang.
Person 1: Who is that amazing bassist in Twenty Twenty?

Person 2: Oh, dont you know? Thats Jack Halliday!
by TheOneWhoGotAway. February 05, 2011
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