Emergency Landing means in slang: 1. Start by getting up with your girl and doing 69.

2 Keep her eating out

3. Just before she completey climaxes, release her from you grip. Watch her tumble to the ground and land on her neck.
(in Slang Dictionary, added by Maximus Morris)

What else does Emergency Landing mean?

You have to vomit so much that your cheeks touch the toilet seat. This is usually a sprint with your pants down.
(in Slang Dictionary, added by Inés Cortés)