Bradley effect means: A theory concerning observed discrepancies between opinion polls and election outcomes, according to which some white voters who intend to vote for a white candidate may tell pollsters that they are. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.