Picture Crashing 

Deliberately inserting yourself into the background of a picture taken by a random stranger or into a group photograph where you are not a member of the group.

We saw these tourists posing for a picture down by the Washington Monument and couldn't resist jumping in and picture crashing just as the shutter clicked.

Picture Crashing by The other Big Guy December 3, 2007

Castle Crashing 

Castle Crashing is the act of intruding into a weak to mediocre relationship with the sole purpose of dismantling the relationship so the person of interest is single. Once the person of interest is single, one can make their move but beware, not all relationships can be castled crashed. An attempt may result in the embarrassment of yourself.

Person 1: "Did you here?"
Person 2: "What?"
Person 1: "Mike just tried castle crashing but it back fired. His dm's got screenshot-ed and posted."

Castle Crashing by Freddy adu January 27, 2018

blues crashing 

To blues dance in a location not normally used for a dance, such as a park, restaurant, or other public place. An idea that was adopted from lindy hoppers, see lindy bomb.

Hey we are blues crashing the mall tonight, wanna come?

blues crashing by lindyaholic February 23, 2010

channel crashing 

The entry by many irc users at once into a bot controlled channel when the original op / creator is not present. Trespassers chat as normal, drink all the owner's alcohol, become rowdy, break stuff, then leave. The only evidence is the virtual grafiti left in the log files.

Bored with their regular routine, the users from #chatmeup decided to go channel crashing.

channel crashing by SoylentBlack July 21, 2004

thunder crashing 

When you kiss someone and you get such a strong feeling of love, care and being safe that it feels like thunder is crashing all around you.

Like falling into a black hole knowing that there must be a bottom but not caring.

"Did you feel that? It's like thunder crashing around us."

thunder crashing by Sirius.ly December 21, 2015

Wall Crashing 

Sending a Facebook friend request to someone you don't know, with no note or other explanation of why you are friending them. Variation: Wall Crasher, one who wall crashes.

I got three new Facebook invitations today, but two of them are wall crashing jerks.

Wall Crashing by Mr. Dicon June 21, 2011

gate crashing 

The act of taking someones anal virginity.

(Jon) - "Hey how was the date with Kate"
(Lewis) - "Oh its was great. We went to dinner and we were gate crashing by nine"

gate crashing by TIOIOI July 5, 2008