Source : Webster's Revised Unabridged Dictionary (1913)

Fillip \Fil"lip\, v. t. [imp. & p. p. {Filliped}; p. pr. & vb.
   n. {Filliping}.] [For filp, flip. Cf. {Flippant}.]
   1. To strike with the nail of the finger, first placed
      against the ball of the thumb, and forced from that
      position with a sudden spring; to snap with the finger.
      ``You filip me o' the head.'' --Shak.

   2. To snap; to project quickly.

            The use of the elastic switch to fillip small
            missiles with.                        --Tylor.

Fillip \Fil"lip\, n.
   1. A jerk of the finger forced suddenly from the thumb; a
      smart blow.

   2. Something serving to rouse or excite.

            I take a glass of grog for a filip.   --Dickens.

Source : WordNet®

fillip
     n : anything that tends to arouse; "his approval was an added
         fillip" [syn: {bonus}]