Final answer:
Tracer says 'Bombs away!' when she ults in Overwatch.
Step-by-step explanation:
When Tracer activates her ultimate ability in the video game Overwatch, she says, 'Bombs away!' This phrase is a trigger for her ultimate ability, called Pulse Bomb. The ability allows her to throw a sticky bomb that attaches to enemies and explodes after a short delay, dealing high damage to those caught in the blast.