The meaning is that you are going to go out and get smashed, off your head, wasted, proper pissed. When someone says Im on a Nixon tonight it means they are going to go on a proper bender, Only the strongest can survive going on a Nixon. You have to be a proper party animal to be able to handle it.
''Hey Joe was on a right Nixon last night, proper hanging today''
''Im sooooo rough, was on a Nixon at the weekend''
''Can't get out my pit today mate, went on a Nixon last night''
When one is said to 'pull a Nixon', it means that s/he was in a position of power, until screwing up really bad. Facing the consequence of firing/impeachment/whatever, this person resigns to avoid this punishment, as Nixon did.
When introduced for a speech for which you are unprepared, you extend both arms and hands, fingers making the peace sign. A plan can be formed during the resulting applause. Former US president Nixon's famous gesture.
Jerry decided that pulling a Nixon when he was given that award at the benefit would be useful. He figured out his whole speech during the applause.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.