Rp:
Where people of any nature act out actions and pretend to be in a certain situation. This does not have to involve sexual references or trying to make the other person horny as ♥♥♥♥.
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Erp:
Where people of any nature do certain actions that may seem erotic, to try and influence the rest of the roleplayers to gain a cetain satisfaction from the role play.
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Herp:
(Informal) Where the roleplayers are horny as ♥♥♥♥ and just want to go all harcore on your ass. (Formal) Where you do Erp but the role players are more horny and need to go a little more rough to get their feeling quicker.