The action of sniffling while snorting at the same time. Usually not actually snorting anything, but makes it sound like you are. Usually only used by internet users.
I was about to finish until I heard a snifflesnort. Shit got weird.
Alt. Example: When you're balls deep and about to get lost, someone walks in and a snifflesnort ensues. The cross between an "Oh, what the fuck that's my sister and holy shit you have a hairy ass."