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Accidentally play the violin 

Going to the bathroom for an innocent reason (bathing, hygiene, grooming) but ending up masturbating furiously or partaking in other sexual acts often that are intense whilst in the bathroom. A verb describing hormonal boys but is not exclusive to the gender.
He went to go pee but you could hear him accidentally playing the violin.
Billy used to frequently accidentally play the violin but now he mostly does it in public.
"I'm going to the bathroom now." "OK but be careful to not to accidentally play the violin"

accidentally-on-purpose 

Phrs. Seemingly accidental but with veiled malice or harm. Childish in nature, but not necessarily confined to children. Associated with the British.
"Tommy broke the TV kinda, accidentally-on-purpose, you know..."

accidentally on purpose

This is a word that my sister & I & our friends all used in the 70' & 80's as kids growing up.

It meant that you did something on purpose, (possibly something you already suspected wasn't a great idea)

but a larger unexpected outcome that resulted was an accident.
I was skipping stones in the lake & I accidentally on purpose hit Christina in the head with a rock. (true story...why was I skipping stones in the direction of anyone's head!!)

In 7th grade I accidentally on purpose flooded the home ec classroom with suds because I decided to throw a bar of soap into the dishwasher to see what happened after the teacher specifically pointed out that we should only use dishwasher detergent. (true)

I accidentally on purpose got a huge burn blister on my thumb when I pressed it on the outside of the waffle iron at my godmother's house to see if the outside was also hot like the inside. (also true)

accidentally myself 

An update to my previous definition:
"accidentally" is actually an old meme. Use with caution on teh Internets, especially around places such as /b/.
LovetteCher: HEY GAIS I ACCIDENTALLY MYSELF WITH THIS MEME.

Anon: Lovette Cher can't define worth crap. She accidentally accidentally. Derp.

Accidentally on Purpose

1. When you have every intention of meeting "that" guy for a drink...but don't want him to asume it.
"Ok, I may show up accidentally on purpose"

2. Deliberately, but feigning (not by) accident.

Origin
The first printed record of this phrase is from The history of the famous preacher Friar Gerund de Campazas, by José Francisco de Isla, 1772:

Tell us what is Modesty of Voice, for you happened accidentally on purpose to drop this word, and I don't rightly know what it signifies.
footnote:
Accidentally on Purpose was an American television situation comedy series, which premiered on CBS on September 21, 2009 and concluded on April 21, 2010.

accidentally in love

person 1: situ feng and qingqing from accidentally in love in netflix are my otp!
person 2: i love them