What does this sign mean?

It looks very intestinal to me.

Good guess on the "dried up glue like substance." I'm assuming it is on a snowmobile trail like you also guessed. I will keep reiterating what you said because I haven't a clue. 

Or, maybe urban slang for "snowmobilers have right of way at all times."

It's Sanskrit for, "Peace be upon you, especially if you ride an Arctic Cat."

It means a fierce dog lives here, but the landowner will feed you if you tell him a sob story.

Forest gnomes claiming their turf.

Trail head to the Evil Clown camp.  Some knucklehead hung it sideways.

"Warning, pregnancy may result in back aches."

"Trespassers will be splattered against a board."

SQUATCH ROADSIGN!

"PICASSO WAS HERE (working secretly with new 'glue medium' in the woods).

This,could be worth billions!

[img]http://www.perfectduluthday.com/wp-content/uploads/comments/sweet-album-cover.jpg[/img]

People who are good at graphic manipulation should be better than me at turning this thing into an album cover or logo or something.

I agree with the "intestinal" comment, but this altered version is a bit more like ancient snake remains.

Pretty sure it means "gorilla glue was used here."