haha.. you're friends are highly misled.
muscles atrophy (shrink) if they aren't used.. so by not going to the gym and eating all day, they're just going to throw some fat on the body.
but when you LIFT hard and BULK (eat tons of food)... your body will distribute this weight all over. some will be as fat, but your muscles will grow. and THEN you can incoorporate cardio and lower your calories and wash away the extra fat and have some nice muscles underneath. that's how it's done.
your friends =

wrong.