Mirage Connector Smoke from Apps Ramp
There are other connector smokes, but this is the one with least one-way space for the CTs. The other ones land on lower steps in the stairs and allow someone to peek short over the smoke.
Line up on the brick shown, aim at the smudge below the window (it is not aligned in the center, but a little bit to the left) and jumpthrow. When practicing, make sure that it lands on the step shown in the video and check the one-way angles for the CT.
As seen in the video, a CT could still see short from the right side of connector, but only if they go deep in the smoke to check. For your regular MM games, this smoke should allow you to push short without the CTs seeing it.