Is a saying to express delight in supporting a popular soccer team called Arsenal (from London, England). The team itself is made up almost completely non-english players. People who shout 'up the arsenal' are closet homosexuals if not fully practised
"Up the Arsenal!".... we love you arsenal. we have come here all the way from Tottenham Court Road
Pajama casual is a term used when working from home and preparing for a video conference. All business above the waist and your pajama pants down below.