"This computer can only handle 512 megs of RAM, that is a huge bottle neck." Refers to a computer problem.
"The old phone transfer system was causing major bottle necks in our productivity, I'm glad the replaced it." Refers to a business problem.
"The fact that this copier can only hold 100 sheets at a time is a major bottle neck." Refers to a business problem.
Keith: "My girl made me take a public oath of alcoholic abstinence, she's totally bottle necking me."
2: (n.) A woman with no gag relfex.
2: She's definatly a bottleneck, she had no gag reflex at all.