The act of giving head, blow job, oral, eating out, etc... the word is a combination of "slurp" for sucking & "derp" for sounds being made while attempting to talk with genitalia in ones mouth.
It's that time of the month, so Jenny gave Johnny a little slurp-a-derp to calm him after his busy day.
by RaCeR_X November 22, 2013

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