(n.) an affectionate cutdown that intertwines "silly goose" and a goose-like sound effect;
usually combined with a giggle/smile/wink/friendly poke in the ribs;
*may also be connected with the suffix "-er"
Note: not neccessarily related to/connotating the word "wonk" or the act of "wonk-ing" (see definition submitted by SirWonkus).
"You silly goosewonk!"