A metaphor for the weight one inevitably gains when one migrates to London for an extended stay. It is attributable to the face-paced lifestyle that leads one to eating mostly take-away and fast foods.
Person 1: "I reckon i'm getting a little tubby. I think i'm developing love handles."
Person 2: "Yeah well you've been here in London for three months now. That's the heathrow injection right there. I've been here for two years now. Look at this flab on me. I slap it and it makes waves."
When you think of such a good word or phrase and no one else thinks its good, but you ask Urban Dictionary to add it and they approve.
Alec: Bro, Kelly called me stupid so I called her a 'gir-ass' (like a giraffe) and everybody was laughing and saying it was stupid but it just blew up on Urban.
When a person or animal passes gas when one's buttocks is in direct contact with the furniture where one is sitting so as to make the smell of the flatulence stay in the furniture after one leaves the scene. As a practical joke, this is sometimes followed by someone else sitting in the same spot moments later, only to push the foul smelling flatulence back out into the air where one can breathe.
Person #1: Why is James flailing his hands in front of his face?
Person #2: Because I just gave that couch a stink injection.