This is used to describe someone who gets way beyond boong drunk. they are usally seen out stumbling around, not been able to talk properly.
Liam - i saw Cassie out at metros on the weekend she was cassied"
by benno86 June 01, 2012
In a state of complete shit-faceness; drunk off your ass; unable to reject sexual favours of anysort. (Especially on weeknights)
No man, she was just totally 'Cassied'
by Funkymonkeygoofball July 16, 2010