Easy peasy squeezy lemons
In CS:GO, when you get a one-hit kill while your enemy is still screaming from the previous round.
"I headshotted him before he even turned around. Easy peasy squeezy lemons."
"I got a triple kill in ten seconds. Easy peasy squeezy lemons."
"I died once and then came back and killed everyone. Easy peasy squeezy lemons."