Specifically describes a girl who acts like a guy and looks like a guy (to a certain degree) but denies being gay; however, it can also apply to anyone basic.
When you are shaking and losing so badly in a RuneScape clan war that you think the other clan has way more people out than you do. More often than not, the other clan has half the members you do, but they are actually quality. The most common specimens that fall for the #BDeffect are members of Kala, typically those with names such as Nipsu and Johannes.
Nipsu: YO THEY HAD 10+ AND WE HAD 4!!
Johannes: Actually they only had 5 and we had 8. We had several extra bolt raggers thanks to our mass recruiting!
Nipsu: How??
Johannes: That's the #BDeffect
a twitter event where the simmosa breakdown group chat started streaming ben feldman’s cover of ‘baby, i need your loving’ from the show drop dead diva