This is reference to John Belushi in Animal House. When he was in the middle of an inspirational speech, he asked the rhetorical question: "Did we give up when the Germans bombed Pearl Harbor?" When questioned, Otter said: "He's on a roll, just let him go".
(When someone attempts to interrupt you) "Hey, just let me finish, I'm having a 'German Pearl Harbor Moment'"
An annoying twitter user who feels the need to tweet and upload pics about every last aspect of his life and comes up with stupid hashtags thinking he's clever.
Tweet Post: "sitting here in windy city @somestupidcafe with @_____ & @______. Portions r huge... LOL #ruiningmydietinchicago"
Reaction upon seeing it: "What a fuckin tweet geek"