wallflowering 

the planned activity of attending a party or social gathering and blending into the background; wallflowering is a benign activity for shy people or individuals who enjoy listening in on conversations and engaging in harmless people watching; it is NOT stalking

Jason wasn't in much of a talkative mood so he was going to hit his buddy's party, do some wallflowering for about an hour, and then slip away quietly.

wallflowering by Sexy Simian December 4, 2010

Wallflowering 

Decorating ones wall with frail emo children in a decorative manner.

X: hey what are you doing tonight?
Y: I was thinking about going out to find some wallflowers so I can do some wallflowering tonight. Wanna help?
X: no, I'm good.

Wallflowering by Sq33k December 7, 2010