A combination of "singer" and "singing." Can be used to mean either, but is usually used to talk about how someone sings, as it reflects both the SINGER and the quality of their SINGING!
Mark's singering was fantastic, I can't believe it!
I went to a concert last night, ugg, the singering was horrible!
The act of flirting rather than working, sitting on one's ass, eating Subway and putting absolutely no effort into one's job. AKA being horrible at life in general.
At least he's trying and not singering it.