(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).