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3.
When two females bump their breasts against each other's as a symbol of friendship, accomplishment, or joy. Much like when two males chest bump.
Cara and Kristin gave eachother high two when they got A's on their test, much to the delight of their male 3rd grade teacher.
by Dave Singleman March 31, 2005
 
1.
When two females bump their breasts against each other's as a symbol of friendship, accomplishment, or joy.
When they both recieved A's on their exams, Kelly and Erika performed a High Two, much to the delight of their male classmates.
by Charlie September 26, 2004
 
2.
1. when u slap two fingers with another person's two fingers
2. when a penis slaps against another penis 2 x's
3. when a penis slaps on breasts 2 x's
They high twoed when they both got the same grade

He accidentally high twoed this other guy in the toilet

He high twoed her during role play
by fashion dude May 14, 2014