'tis when a woman's nipple gets real claustrophobic and sticks its head out for a deep breath, while the woman does not notice at first. This is very common with actresses. Their nipples get nervous a lot, and need some air sometimes. A lot of the time, they stick their head out, and decide that they like all the attention so they linger longer than needed. This usually causes embarassment.
When Tara Reid was on the red carpet, she experienced a nipple slip. Luckily a friend nearby helped her out, for she was unaware that her nipple was getting more attention than her the entire time.
by Jack Daniels January 5, 2005

or slipped the tounge,
when people are kissing without tounges then one of them slides their tounge into the other's mouth
when people are kissing without tounges then one of them slides their tounge into the other's mouth
by Dawn June 15, 2002

getting laid off from work
by myfootsmells February 16, 2006

by Refreshment Boxx April 3, 2010

They were drag racing for pink slips.
by FQP June 20, 2012

An extremely innapropriate remark or action bluntly made to a large public audience. In reference to Mayor Rob Ford.
"I have plenty to eat at home. oh shit, I fucked up, sorry toronto, just another fordian slip" - Rob Ford
by CakeBadger November 14, 2013

George: PAHAHAHAHAAAA!!
Harry: DUDE! Stop pissing yourself! Man, you're slipping yellow all over my bed you mofo!
Olive: Hey Brittany, you know Jenny?
Brittany: Yeeeeeeeahhhhhh hunni
Olive: Appaz she slipped yellow at Miriam's party on Saturday. Now everyone calls her pisspot and Emanuel dumped her. Talk about a skank!
Brittany: Yeeeeeeeahhhhhh hunni
Harry: DUDE! Stop pissing yourself! Man, you're slipping yellow all over my bed you mofo!
Olive: Hey Brittany, you know Jenny?
Brittany: Yeeeeeeeahhhhhh hunni
Olive: Appaz she slipped yellow at Miriam's party on Saturday. Now everyone calls her pisspot and Emanuel dumped her. Talk about a skank!
Brittany: Yeeeeeeeahhhhhh hunni
by pipislipper October 3, 2010
