'GOMming', the accompanying verb to 'GOM', is the practice of spending time with said female. Originally, the term 'GOMming' was only used (again in inflammatory fashion) whence the 'GOM' in question was sacrificing spare time to entertain his ladyfriend in place of his friends. The term has since transgressed, and any time spent with a female, whether in place of time with his friends or not, is considered 'GOMming'.
In recent times, the terms 'GOM' and 'GOMming', due to their offensive magnitude, have become ongoing slurs towards those not currently offending but with a history of doing so. Scholars now maintain that being a 'GOM' or indeed 'GOMming' are not individual occurrences or practices, more a 'mindset, attitude, and a way of life'. The term is incredibly difficult to shake and has is known to cause sever psychological damage to those sullied by it's use.
Other uses include: GOM off, GOMming 'ell, GOMtastic, il GOMmeri (Italian), and GOMpig (used in only the most extreme circumstances).
Mattheu: "Chris are you out tonight"?
Chris: "Sorry Mattieu, I'm GOMming tonight".
Mattieu: "You fu*king waste. Lads! Chris can't come out tonight because he's GOMming".
Chris: "I'm out tomorrow night mate! The gf is on at the moment, gotta keep her sweet".
Mattieu: "I hope you catch clap you cretin".
Fred: "Wubble when on God's green Earth can we hang out?".
Wubble: "Soon my good man; I have been incredibly busy with work and my new football team".
Fred: "Any danger of you not GOMming for one minute?".
Wubble: "I'm not GOMming; Fred I've been single for nearly a year!".
Fred: "Once a GOM, always a GOM. You sicken me".