What does "wanjangle" mean?

It’s a word he invented. Could mean anything.

He says, “wang-jangle”. It’s slang, roughly meaning “to fiddle around with”.

As @thorninmud said, it is used as a synonym for “fiddle around”, which is an idiomatic description of actively manipulating something to reach an outcome but without planned steps to achieve the goal.

Finagle, Mickey Mouse, jury-rig, patch, wire together, duct tape together, baling wire repair/procedure, give it a half-assed attempt, non-professional back yard work, mish-mash.

@kritiper Got it. Feels to me like you captured all of the slang synonyms that fit.

“You only need to do one simple thing, follow the instructions.” immediately follows.

So, in this case “wang-jangle it” means all the other methods you have heard or can find for testing when pasta is done.

I would substitute “You certainly don’t have to be creative about it.” in this context. Doesn’t translate the humor, but carries the dialogue.

You could say, “Certainly don’t have to use the thingamajig on it!” if that translates. Humor and fits with the video.

Guys if you watched any of his other videos – you would know. But basically, wangjangle is a word he made up to mean ‘mix around’. Like for example, wangjangling the ingredients together.