Giddyup! is an achievement in Plants vs. Zombies 2. It requires the player to unleash the Wild West Gargantuar, or more accurately, beat Wild West - Day 8. It is worth 25 points on Game Center for iOS devices and 2,500 XP on Google Play Games for Android devices.
The phrase "giddyup" means to command a horse to go ahead or move at a faster pace.
- See Wild West - Day 8.