You have to find all 8 of the Big Nate comic pieces, and arrange them in the frame from the guy at "Klassic Komix". Find all the pieces and arrange the panels to make the complete comic. Give him the comic and he will give you some gum.
You use it when you get put in detention for chewing gum so you can get into the filing cabinet.
In big nate island, find all the missing comic pieces and then give it to the guy who wants it.
On Big Nate's island
You can get chewing gum after you complete the comic and give it to the guy asking you to complete it
big nate island has lots of gum included!
You stand outside the detention room door, and since a sign says "No gum-chewing", chew the gum. Once you do, a teacher will stand by you and say, "I smell gum! Get in there!"
You make the stink bomb. If you already have it, go get detention by chewing the gum. Use the stink bomb to get the teacher out of the room. Go in the file cabinet.
You eat it.
all you have to do to get a pack of gum is: on Big Nate Island you have to collect all of the big nate comic book pieces.
They are out of Bubble Gum in the Pop-In Shoppe. But you can get gum from the guy in the Klassic Komix shoppe. Get the frame for the comic strip from him and assemble all 8 missing pieces. (see related question)
On Big Nate island, you have to go into the Komix Shop, and talk to the guy, then find all of the Big Nate comic pieces, assemble them, and give them to him. Then he'll give you gum. *Various kinds of "effects" using gum are also available in the Store, but do not have anything to do with Big Nate Island.
You chew bubble gum in front of the door to the detention room by the sign that says "No Gum Chewing."