A combination of the words sly and bilingual. It is reserved for individuals that posses a cunning ability to manipulate there firstlanguage into a second. It can be used negatively or positively depending on the surrounding sentence.
Example 1: Not only is John Edwards a lawyer and a politician, he is also slylingual.
Example 2: Jay-Z's verse on "Diamonds From Sierra Leone" is so slylingual
An undying love between One Direction bandmates Louis Tomlinson and Harry Styles, lead by other bandmate Captain Niall Horan. This relation'ship' started when Louis and Harry were both in the X-Factor toilets and 16 year old Harry urinated on 18 year old Louis' shoe and said "Oops!", Louis replied with "Hi!". Later on they found out they were going to be put in a band together, then Louis proceeded to jump into Harry's arms and let Harry carry him offstage. 9 years into this relationship and the 'chicken stuffed with mozzarella wrapped in parma ham with a side of homemade mashed potatoes' story is still alive and so are our larents.
Person 1: Did you see the Paris interview? Larry Stylinson is so adorable!
Person 2: I prefer the Wellington moment but the Paris interview is always in our hearts!
"Does the little one with the cheekbones know that the prince is in love with him?" In which the little one is Louis, of course, and the prince is Harry. Also chicken wrapped in parma ham stuffed with mozzarella with a side of homemade mash.
Harry: Lou, can I give you a blowjob?
Louis: I'd love it, if you just wait.
Niall: *turns to look at Larry* anfjkebkw LARRY STYLINSON IS REAL BITCH I SHIP BULLSHIT