My dirty mind isn't helping me...
Let's keep it mature:
Food
I could say the word Spit put me in mind of a bird
In some Asian cultures,
bird’s nest soup is not only a delicacy but a medicinal concoction, believed to aid digestion, strengthen the immune system and — perhaps its biggest selling point — increase libido. You might think that there must be some magical dried leaves and twigs in those nests to have such a power, but think again.
These nests are actually made out of bird saliva, which has dried and hardened. That’s right; when you’re eating a bowl of bird’s nest soup, you’re having a
bowl of spit (and other ingredients).
And swallow being a Bird......
However I would be lying. Got it in one Bro, my apologies