Named after Leopold Slikk or the Angry German Kid, is an effect where if you post something satirical on the Internet, people will perceive it as real without researching the backstory of said video.
A Slikk slave is someone who has been trapped without knowing it by the all engulfing sexual magnetism of that one douche bag thats taller than 6’3. These women are typically attractive and hoarish and their sexual ambitions lead them astray.
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".