From Worms Knowledge Base
Buffed is a worm state where the affected worm gains 15 health per turn. This state is created by a worm using a medibuff syringe. Worms in this state will appear as a blue-hued worm with blue crosses emanating from their heads and also have their name tag flash blue. The idle animations of the worm will be doubled in speed, due to the extra energy the worm has. This lasts for up to 5-8 turns, which the game chooses randomly. Using another medibuff syringe in this state will not stack the effect. A buffed worm hit with poison or radiation will revert back to normal. Though the radiation effect will be applied on the worm on the next turn, assuming the worm is standing in a radiated area.
Applying the buff effect will remove all other status effects.