On 23 July 1981, Barney's biological father, Jerome Whittaker, took Barney to the National History Museum, under the guise "Uncle Jerry". The last words his uncle told him before he left were "Never stop partying".
Then six-year-old Barney knocked down the blue whale hung from the museum's ceiling by throwing a triceratops' rib at it. Throughout his childhood, Barney was constantly lied to by his mother to protect his feelings; for example Barney was told by his mother that he couldn't play basketball because he was too good, and it wasn't fair for the other kids, but in reality, his coach knew Barney wasn't good enough for the team. In seventh grade, Barney was bullied by Matthew Panning, who bragged about how he had sex with 100 girls.
It was revealed in The Leap, that Barney had confessed to Lily at some point that, in his early life, he'd wanted to become a violinist.
In 1998, Barney had graduated college and was working with his girlfriend, Shannon, in a coffee shop. He had planned to join the Peace Corps and go to Nicaragua with Shannon.
Barney's life of debauchery wears thin as he matures and experiences several serious relationships, in particular his on-off relationship with Robin.
His elaborate seduction techniques are a constant source of humor (typically for Marshall), amazement (typically for Ted), and disgust (typically for Lily) for the group.
When she sees he's back, she tells him that her father, who was still financially supporting her, wouldn't allow her to leave and told him to go on without her.
As of Last Forever, Barney and Robin divorced after three years marriage (2013 - 2016), being unable to maintain their relationship while Robin's career went global.At the urinal, Barney told Ted a fake story about this being the first time he took his deaf brother out since their mother died and how he puts his dreams on hold to take care of him.Ted believed the story, which surprised Barney and admitted that he made up the story while peeing.When he returns, he discovered she was cheating on him with a businessman named Greg, who Barney had previously served as a customer, and who humiliated him for being a hippie.Greg tells Barney the key to picking up women is to have money and suits.Barney slept with Rhonda, losing his virginity at the age of 23.