glue bag is either the 1:object- a bottle with a bag attached with glu poured in used 2 inhale and get "high" or 2: the person a person who sniffs glue or 3:it can be used as an insult meaning the person is stupid or slow.
1:look theres a glue bag
2:oh my god theres them glue sniffers again
3:who is it? tommy, aye hes a gluebag that wee lad