What is "funneling"

alt. (context American spelling English) (present participle of funnel English) vb. (context American spelling English) (present participle of funnel English)

Funneling may refer to:

• Using a funnel (a pipe with a wide, often conical mouth and a narrow stem)
• In cryptography, funneling is an undesired characteristic of some hash functions that causes collisions when keys differ by only a few bits.
• Funneling, the process of using a beer bong
• Funneling at the internal orifice of the uterus