Snot flapping
Using your fingers instead of a tissue, then flapping your hands about to launch the snot off them.
I walked in the bathroom and this dude was just snot flapping into the sink!
flap snot
The lubrication that is created within a woman's vagina when sexually aroused. May be found in the folds of the inner and outer lips.
I fingered her pussy and my hand got covered in flap snot.