Two people that have got 'Gill' with each other, for some reason or another are angry or annoyed with each other, often resulting from a disagreement. Normally said by a third party listening in on the argument, in a comedic tone.
''Massive Gill'' is an extreme version of ''Gill''
Bob: ''chris is fat''
Chris: ''ur a retard''
nick: ''ooh massive gill''
p.s grange likes old men
