A way to proudly say you are working hard and putting forth great effort. Literal or metaphorical sweat is equivalent to (matching) the difficulty of a task and the work being done. Also used when you are trying as hard as another person while competing, working together, or comparing. You are trying to match their sweat/effort.
She worked up on that ladder for hours. Girl was matching sweat.
The word "fronz" is an extremely versatile word. It can be used in nearly any way necessary such as being used as a verb, a noun, the vocalist of a shitty metal band, an adjective, and many, many more.
EX1:"oh man, i just fronzed on myself!"
EX2:"dude, i totally fronzed this chick the other night."
EX3:"have you cleaned your fronz today?"
EX4:"I went to an Atilla show, and Fronz tried to touch my genitals."