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2.
A stick, or possibly broomhandle, approximately three and a half to four feet long with a mirror attached at one end.

Usually used when one is have intimate relations with a sheep to see if the sheep is smiling.

Originally invented in Montana, where sheep outnumber people almost four to one.
There goes that pervert shepard again, with his bottle of wine, candles, and Montana Stick.
by SEB319 March 07, 2006
 
1.
A wooden pole of about 42 inches in length with an attached large mirror at the bottom end. The Montana Stick is used predominently in the act of bestiality so that the human may position the mirror to provide confirmation that his or her animal sex partner is smiling and having a good time.
"The accused woman with the strap on cannot be charged with animal cruelty because her Montana Stick indicated that the goat she was coupled with was enjoying himself"
by David Barrett March 16, 2006