What does "slather" mean?
"Slather" is a verb meaning to smear or spread a large amount of some sort of substance (usually a liquid). The speaker has used it here to make the process of a mosquito spreading saliva onto human skin sound a little more interesting. Ex: I slathered on a lot of sunscreen so that I don't burn under the sun. Ex: The baker slathered icing onto the cake.
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