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4.
A squealing noise made when one laughs excessively, which makes said person sound like a dolphin. Thus: dolphining.
We made Jessi laugh so hard that she was dolphining it up.

Vanessa made Karli laugh so hard that she somehow managed to start dolphining.
by Jason, RIGHT! April 09, 2010
 
1.
Dolphining is the practice of posting a status message by using someone else's Facebook account. The status message is intended as a prank, and has the purpose of showing the world that the owner of the account was foolish enough to allow somebody else to access his/her Facebook account. Examples of foolishness include forgetting a personal computer unlocked, or leaving a mobile phone laying around.

The name comes from the fact that the status message has to contain the word "dolphin," or be talking about dolphins. This way, whoever sees the messages instantly knows about its nature and can laugh at the victim.

After realizing that he/she has been "dolphined," there is a strict honor code that the victim has to follow. In particular, the message can be deleted only if none of the victim's friends has liked it yet. If the post receives at least one like it will have to be left unchanged and accessible forever, as a testimony of the victim's lameness in allowing someone else to access her Facebook.
Ali has been victim of dolphining four times in the last two days.
by dolphin master May 09, 2014
 
2.
Using only core strength and no arms or upper body strength during sexual intercourse. Having sex without using arms at all, floundering around like a dolphin outside of water
Rumor has it that Joel has gotten really good at dolphining, his core strength is so good he doesn't need to use his arms during sex!
by TieFighter November 17, 2010
 
3.
Similar to sharking
When someone (boy or girl) pursues the opposite sex desperately in a friendly manner
Dude, You are dolphining that girl"
by Thetruemasterofdolphin August 03, 2011