Placego 

The act of doing a task that's already been completed because one doesn't believe it has until they themselves have done it.

"Even though the elevator button is obviously pressed, that guy still presses it because he doesn't trust it like it's a placego."

Placego by ShabeRaven October 28, 2016

Placebo 

Bullshit

Girl:"You know its all Bullshit right?"
Boy:"What is?"
Girl:"Your Medication"
Girl:"They're Placebo"
Boy:"What does Placebo mean"
Girl:"Placebo means Bullshit"

Placebo by ItzWeezy September 23, 2017

Placeholder 

the person one dates, makes out with, or sleeps with while waiting or actively searching for the love of one's life - who is quite often found during or immediately after relationship with said placeholder.
Though also viable, cute, and longing for a longterm relationship, there is often some unknown 'thing' in the placeholder's manner, ambition, world view, or timing that often prevents the placeholder from being "the one."

"I just found out Chris married the woman he started dating when he was still sleeping with me. He told me he didn't want a serious relationship. I feel like such a placeholder."

Placeholder by 50_dates October 11, 2012

Placeboi 

A male fan obsessed with the English rock band Placebo. Especially Brian molko.

Placeboi's usually dress in black and wear eyeliner. They unabashedly wait hours to be front row at placebo concerts.

Placeboi by bahhh678 March 5, 2015

placeboware 

1. Software that prescribes to, but does not provides any value or enhancement.
2. Software that provides nonsensical increasing or decreasing values to system resources.
3. Software that suggests, but does not deliver any improvements to lifestyle, productivity or success.
4. Software that makes the user happier once it has been run.

Below are examples of placeboware, but this is by no means an exhaustive list:
Memory Optimizers / Managers / Cleaners / Defragmenters
Flash Disk Optimizers / Defragmenters
Operating Systems that require a single mouse button

placeboware by MarkRB November 13, 2009

placebo effect 

This is mind over matter; when somebody believes that something will happen to his health, it does even when it wouldn't have otherwise. This generally happens when doctors tell patients that their health will improve even though there's no logical reason to believe that; the patients' optimism then helps heal them.

The doctor gave Jimmy sugar capsules and told them it would cure his headaches; it did even though the capsules didn't do anything. Classic placebo effect!

placebo effect by iLikeSoup February 17, 2010

Placebo Day

"Placebo Day" is the unofficial holiday for fans of the rock band Placebo, held annually on 2 May. Its origin lies in a lyric from the band's song "The Bitter End": "We're running out of alibis/On the second of May."

The original group to have started this holiday seems to be the LiveJournal Placebo fan group "placebowhores" (placebowhores.livejournal.com) although it may have originated elsewhere.

"I'm going to listen to 'Nancy Boy' all day long this Placebo Day!"

Placebo Day by prettygolucky May 14, 2006