Of course they mean that they doubled their already obese weight when they say "I let myself go". They wan't people to think that they look like shit because they're too busy being selfless and tending to their children, when in reality they were disgustingly huge fat fucks before they got knocked up. And by being "selfless", what they really mean is that they sit on FB making posts about how hard being a mother is and how they deserve x,y,z for taking care of their offspring, while said offspring is in front of the idiot box all day because lard mom doesn't want to waddle anywhere. Fat parents are the worst.