Dlo is short for downlow which refers to: http://www.urbandictionary.com/define.php?term=Down Low when black males try to remain straight by having sex with other men then go home and sleep with their wives.
Lol as someone who has used OkCupid in the past and only selects black as the ethnicity filter... The amount of black women that don't want any "Downlow (expletive)'s" is very high.
Wow. Thought that was just sleeping around. Now there is an extra meaning to it too. Thanks for the info.