In its mouth, you say, and then it spits it out on your finger.
What? You don't like its old molasses on your finger?
No, of course not.
It smells bad, and it is sticky and disagreeable to the touch, and if you happen to put your finger in your mouth it has a nasty taste.
John says he hates to touch the grasshopper on account of this molasses.
You all do?
Well, I guess that is why it makes its molasses; it doesn't want you to touch it.
It doesn't want birds to eat it, or other insects to bother it, and so it smears them with this ill-smelling, sticky liquid.