Lexie,
I think you are as confused as we were when you went to see that singer none of us heard of!
Mrs.M is referring to a show done by a comedian named Gallegher(sp?). His style of comedy is VERY physical depending on LOTS of elaborate props. One of the bits he does involves his "Sleg-o-matic". This looks like a sledge hammer except instead of a steel hammerhead, there is a very large heavy chunk of wood on the end of the handle. What he does with this thing is SMASH all sorts of common food items and other things on a chopping block. What happens as these things get SMASHED is they go squirting out into about the first dozen or so rows of the audience! Since Gallegher is KNOWN for doing this, the folks that get the best seats at his performances bring the most plastic (like clear tarps or painting drop plastic) to protect themselves from the inevitable showers caused by the "Sleg-o-Matic"!
I've never been at any of his performances but I saw him on TV a few times. The show is entertaining, at least a couple of times!
Hope that helps....
Jabbergah