Peter is correct with his first answer.
If you look at the schedule on the site you can normally click on any of the workout descriptions and get a definition of the parameters and aims of said workout.
The deadlift example is the one given but I note they often post TGUs of 50 and upwards as SMMF. I find that I get friction burns after about 20 of these and honestly the idea of rubbing myself down with vaseline before a session in the gym doesn't appeal. If that makes me a puss then a puss I am.
I guess burpees (100+) would do the trick too.
When I read the definition it was one of those times when you think 'I'm doing that, TONIGHT!'.
I nearly always regret that sentiment.