The "Old Firm" are two scoccer teams that unfortunatley dominate Glasgow football (soccer), and the Scottish Premier League; Glasgow Celtic and Rangers FC. They have a history of extreme Catholic/Protestant sectarianism, which is still present amongst a section of their supporters today. Many of these supporters are neds. More enlightened glaswegians support Partick Thistle FC. Most civilised people will take the attitude of "FTOF".
"Nah, Boab, you must be joking - it's the huns... FTOF!"