Fung Fu is an ability for Night Cap in Plants vs. Zombies: Battle for Neighborville. When activated, Night Cap starts striking nearby enemies constantly for massive damage, and ends with a slam. Her movement speed is greatly reduced for the duration, however.
Using Fung Fu right after Shadow Sneak may allow you to catch zombies off guard, allowing for lots of suprise damage.
Certain abilities can be quite helpful for escaping Fung Fu. Foot Soldier can use Rocket Jump to try to escape the ability, All-Star can use Sprint Tackle to either escape or knock Night Cap away, Scientist can warp out, Engineer can use Sonic Grenade to stun Night Cap (can she be stunned during it?) or Speed Pad to escape, Imp can use gravity grenade to keep Night Cap from moving, Super Brainz can use Hyper Jump Thump to get above the ability then punch back down, Captain Deadbeard can use his anchor ability to escape, 80’s Action Hero can use Dynamite Dodge to escape and leave behind an explosive or use Rocket Ride to get above the ability and rain down explosives onto her, Electric Slide can use Funky Bouncer, and Space Cadet can use Gravity Smash to get above the ability and crash down onto the Night Cap when it ends, or use Crater Maker when in a space station.
Other abilities can also be very useful for taking her down, such as the Disco Whirlwind as Night Cap wont be able to get out quickly.