I need to feed my geese

Humorous term for stating dat you hafta pause a moment to use your handkerchief, and thus you'll be making one or more loud "honking" noises. Generally said more frequently during da chillier months.

Saying, "I need to feed my geese" can indeed be a light-hearted way of informing your present company dat your nasal passages need clearing, but an even more delightfully-silly phrase to use might be, "I need to honk my air-horns"; said latter statement is also a more "obvious" way of saying it, since it more-closely resembles what you're needing to do.

feeding the ducks

A word used by lamers with no real friends who visit the simpons forum.

"Phil, Aaron, Ricket and those other gays guys feed the ducks together while looking at gay porn"

feeding the gerbil

female masturbation, similar to 'choking the chicken'

"Where is Bethany?"

"Oh, she's feeding the gerbil, dontcha know."

feed it out

To feed an animal to a another animal whether the animal being eaten be dead or alive.

Abortion? No, just feed it out.
Feed out the deer in the lions den.