The term foggy means to be surrounded by fog or full of fog. It can also refer to something that resembles fog. Fog is a collection of water droplets that are suspended in the earth's atmosphere. It is a type of a cloud.
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what is the definition of foggy
ADJECTIVE [FOG·GI·ER, FOG·GI·EST.]
thick with or having much fog; misty: a foggy valley; a foggy spring day.
covered or enveloped as if with fog: a foggy mirror.
blurred or obscured as if by fog; not clear; vague: I haven't the foggiest notion of where she went.