This is the act of two beefy people competing in an activity. A beef-off is not capable to taking place if one or both of the people are not buff or beefy, if you will. These activities may be: leap frog, checkers, trivial pursuit, telephone, cavity searches, and so on and so forth. This word is not to be taken dirtily or odly. This word must be seriously taken, and if not, flaming pixies will fall out of the sky and stick there various apendages in the false users ear. Use wisely.
"Do you see those beefy people?" "Yeah, They are partaking in a beef-off. Dumby"