To be a Slick-dick is to send a gift to your loved one that coincidentally arrives with near
perfect timing. Not something that you planned, but nonetheless something that enhances the overall
experience for your partner.
In this instance the
appearance of being slick would be unjustified, thus you're a Slick-dick.
Stuart sending an
Easter egg making kit to Susie for her April
birthday made him a "dick". Sending
rollerskates that arrived just as her existing plans unravelled made Stuart a "Slick-dick".