Special bond between a guy and a girl created after both of them have had, alternatively or simultaneously, sexual intercourse with the same girl.
-Hey, Monica, guess who I tapped last night!
-Who?
-Jessica!
-No way, I did her last month. We're oil siblings!
-Who?
-Jessica!
-No way, I did her last month. We're oil siblings!
by Oyster Lover February 1, 2016
Get the Oil Siblingsmug. 1- First cousin and half-sibling at the same time.
2- Child of mother and of uncle (father's brother) at the same time.
3- Child of father and of aunt (mother's sister) at the same time.
2- Child of mother and of uncle (father's brother) at the same time.
3- Child of father and of aunt (mother's sister) at the same time.
Three-quarter-sibling.
by Jazigurn October 28, 2024
Get the three-quarter-siblingmug. My sibling-in-law is a good person.
by Elivaldeq November 24, 2019
Get the sibling-in-lawmug.