Hi Omar,
So if you want to run against a custom AVD (e.g. running Android Lollipop), you can "export METEOR_AVD=myavdname". We will not create the AVD for you when you specify a different name (as we figure that's the whole reason you're specifying a different name!)
Once you have installed the SDK, create a Lollipop AVD using "android avd". If you're on a mac, keep the RAM allocation to less than what you installed the HAXM accelerator (I recommend 1024MB).
Finally, "export USE_GLOBAL_ADK=t" and then try "meteor run android". This should use your Lollipop AVD.
A deeper question is what you're actually trying to do. Are you trying to use a Lollipop specific API? Presumably that would be through a Cordova plugin and - to be honest - I'm not quite sure how that works.
Let us know how it goes!
Justin