Yeah that's kinda weird. Tongue is easier, you can direct it precisely and cover it with saliva. just lick it like a long stamp basically.
there are few things that are worse than sitting around and somebody is trying to pass off a joint that is drowned in spit i dont need to smoke anything like that he he
they're talking about the "glue" that comes on the papers i kinda use a combination of both, but mostly tongue. i probably look really weird when doing this haha