Is when you really don't want to do something, but it needs to be done. Toughing it out is one of the hardest things to practise on a daily basis. If you can accomplish the "thoughing it out" moral than you will be un-stoppable!
"I was up all night drinking and I had to be at work by 5am... I really dont want to be here, but I'm toughing it out."
Jon- "ah man hold on a sec, I got a sliver in my finger"
Gabe- "dude just tough it out we only have five more logs to load"
A strong and resilient person despite their appearance and attitude.
M: All you did was a day of decorating - you're such a weakling!
D: Actually I painted seven doors, skirting, all the wood, the floor and the wall. I AM TOUGHLING
M: He is so small and weak, look at him.
J: Actually he is a black belt karate champ
M: Wow, what a toughling.