Soulmate; best friend; that person who literally would take a bullet for you; someone who you've spent your friendship more apart then together; your true travel buddy; someone who pushes you and believes in you; someone who you can skype with for 5 hours without even realizing it and never get bored; your twin soul; sentence finisher; someone who would make you laugh so hard that you pee your pants
Person A: "I love... chocolate!"
Person B: (at the same time says:) "chocolate!"
A and B look at each other and point while saying "Soulsies"