ryuu ga waga teki wo kurau

This is a famous quote of Hanzo you can hear in Blizzard games like Overwatch and Heroes of the storm.
It literally means: "Dragon, consume my enemies!". In Japanese: 竜が我が敵を食らう

Overwatch explanation:
This is the last words you will probably hear from the angry enemy asian with bow before dead, if you will not run quickly from his sight. Sometimes it is impossible to guess what area will be under this effect, because it can go through walls. It works the most efficient way in combinations with control effects, for example, Zarya ultimate.
Important thing: if enemy Hanzo uses ultimate, you hear Japanese version of this quote. Otherwise, if is used by ally, you hear english version, so it is unnesessary to try to avoid it.

Heroes of the storm explanation:
In heroes of the storm it works the same way, but it is much less dangerous and deals much less damage. Usually, other ult, "dragon's arrow", is considered to be more suitable and it can be used for escape, stun, finishing, interrupting, etc. On the other hand, this ult can be combined with powerfull stuns, for example, E.T.C. mosh ultimate. Also, this ult is one of the best area control ultimates.
Nice thing: you can easily eliminate Abathur with this ult, if he won't wake up in time and get out of it's effect's area.

- FIRE AT WILL
-RYUU GA WAGA TEKI WO KURAU
elimination
elimination
elimination
elimination
elimination
elimination
...
- PLAY OF THE GAME: bastion

oh oh oh time to accelerate

The quote you usually hear from friendly Lúcio when you expect him to heal you up.

- Genji: 199/200 "I need healing!"
- Lucio: "OH OH OH TIME TO ACCELERATE, SPEED BOOOOOOOOOOOOOST"

Lúcio

Overwatch support character, who can provide both area healing and area speed boosting effects. Moreover, he can provide the most powerful shield in entire game using his ultimate "Sound barrier". Moreover, he has splendid "Sound wave" ability, that can literally boop emenies out of your position. Usually, he appears in POTGs exactly by booping enemies off the map.

You also can play as Lucio in Heroes of the storm. The difference between his abilities compared to overwatch is small.

-Lúcio, we need healing
-OH OH OH TIME TO ACCELERATE
-Omfg, Lucio, please
-SPEEEED BOOOOOOOST
...
enemy Mercy hits Lucio one time
- OH LET'S BREAK IT DOWN