Someone asked me that, we were talking about sexual orientation and that kind of stuff but I didn't understand that question.
Pécho is a French slang word for "seduce", mainly used in a sexual meaning (= "sleep with someone"). It is the verlan of choper which means attraper (to catch) and is used figurativlely to say "seduce". Note that it is used as a verb and has only one form:
- Je pécho
- Tu pécho
- Il pécho
As for the plural form, "pécho" can only be used as a past participle: in the passé composé tense for instance:
- Nous avons pécho
- Elles ont pécho