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3.
H2H
hand-to-hand, as in hand-to-hand combat, without weapons. The term does not preclude use of other body parts, like legs, knees, and elbows. It also doesn't require that the entire fight be stand-up combat or exclusive of ground combat, like grappling and wrestling.
Those two drunk fuckers got into some mean H2H combat back outside the bar.
by TheUrbanatorist October 06, 2011
 
1.
h2h
"heart to heart"

spill your guts to a friend during a heart to heart conversation

actually the person doesn't even have to be a friend. go have a h2h with some random person on the street.
I called her on the phone and she was bawling. we had a h2h
by alpha January 20, 2000
 
2.
H2H
"Head to Head"

A one on one competition between 2 players at Worth1000.com, instigated by a challenge in the Head to Head Forum.
So I lost my first ever H2H to lostinyonkers... that stinks.
by Matoogs August 27, 2004