If i may butt in: Yes. Many times with clients too. Just this week I was in a meeting with project managers and consultants from GE, Honeywell, Prysmian and Schneider electric and it was as if everyone was trying to one up each other on the 'fuck' count.

Exactly this. When a fucking router half-breaks at the colo and takes down our sites instead of failing over, we do use such language.