What does 'trimmed' mean in relation to lamb rump?

I'm cooking a Gordon Ramsey lamb dish for Sunday dinner tonight.(This one - its the first on the list, new season lamb with crushed peas http://www.ivillage.co.uk/food/tools/recipefinder/display_recipe/0,,6722,00.html ). The recipe asks for '4 lamb rumps, 140g each (trimmed)'. I went to the butchers yesterday to get the lamb but forgot to write down exactly what I needed, soooo I've ended up with 2 lamb rumps, each weighing 300g with quite a lot of fat on the meat.

My plan was to simply cut the lamb rumps in half, but does 'trimmed' mean without fat?

Not without the fat, but the fat trimmed down.

Thanks for your reply NumbNuts, apologies for the late response, I was cooking. I decided to play it safe in the end and roasted the rumps with a garlic and rosemary crust. It was delicious and now I'm tucking into a terribly unseasonable bowl of pear crumble and custard for pudding!