The rugby version involves getting head-down and having a shoving match with the other side, sometimes involving ear-chewing, scrotum-grabbing, and neck-breaking (although the latter is frowned upon); the software variant is not dissimilar. It has its origins in Agile methodology, although it’s Agile hopped up on crystal meth and spoiling for a fight: exactly the sort of thing you’d expect a bunch of city high-flyers to find appealing (at least in principle, and as long as it didn’t look likely to detonate a large landmine under their bonuses).
Stross, Charles (2014-07-01). The Rhesus Chart (Laundry Files Book 5) (p. 32). Penguin Publishing Group. Kindle Edition.