1.) When your about to fuck your girlfriend and her best friend fuckin calls her and tells her she broke up with her boyfriend
2.) The part of a chemistry burette used in titration experements that keeps the acid or base flow restricted...
1.) Hell yea baby, lets do it --- not now... carol called and shes having a hard time getting over her ex
2.) make sure the cockstop is turned all the way off so the liquid doesnt escape the burette