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The act of roaming, poking, or otherwise hanging about. "Derp" is to be understood as one's overall presence or being, and to "flerp" one's "derp" is to make oneself known, in a positive or numerous way. It is a display that is sure to establish one's dominance within their community.
Guy: Where have you been all day?
Girl: flerp-a-derp

Guy: ohh you've been hanging about
by Dr. Lawrence May 13, 2017
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