People tap double y or 'yy' simply out of habit. It probably originated from someone deciding that it looked cool and it catching on. Otherwise it could have caught on from the double tap y no-scope technique :]
press L3 down as if you were gunna sprint, then double tap Y or Triangle.
Double tap Y then X 360 then shoot!
before you shoot push the y button 2 times.
The traditional way to speed up your reloading on MW2 is to equip the sleight of hand perk. In addition to this, more advanced players can begin to reload and then interrupt the action (sprint,knife, double tap Y or Triangle) just as you see your ammo appear at the bottom right hand corner.
A word with a double Y: sayyid.
Same as shooting a pistol. Press Y to menu,go to ur grenade,press A and EQUIP. Same for shooting istol.aim then throw.
Hold and tap y
"y" will double, too.
Keep tapping A,X,Y,B which is X, Square, Triangle, Circle for the PlayStation 3. or move the right analog clockwise.
you press triangle on ps3 and Y on Xbox 360 !
sayyid
That means that if "x" varies by a certain factor, "y" will vary by the same factor. For example, if "x" is double, then "y" will also double.