Text message sent from a straight male to another straight male, or from a straight male to a lesbian consisting of the word "Mantext," some play on words containing "mantext" within, or any phrase including or ending with "mantext."
In essence, "Mantext" operates on the theory that non-sexuomantic texts are always meant with a degree of disappointment, especially those from men (your bros) labeled "Mantext."
The most demoralizing Mantexts are received by those anxiously anticipating a ladytext, preferably on a rainy Friday or Saturday night while watching Redtube.