Despite the prevalence of Singlish use among the Singaporean public, the vernacular is often seen as "bad English" without rules and grammar, or cast as an impediment to learning the standard register (Wee, 2005). This rhetoric is reproduced by the state (Chang, 2016), often involving the fear that speakers are unable to distinguish and deploy the two varieties appropriately. It is therefore unsurprising that bidialectal strategies involving Standard English and Singlish have never been officially endorsed by the state in its ELT classrooms. This is despite the suggestion for intervention in schools the last 20 years (Alsagoff, 2016; Fong, Lim & Wee, 2002; Tupas, 2018). This study presents findings from a definitive attempt at implementing such bidialectal pedagogy in Singapore in a mainstream secondary school. The study involved strategies for teaching Standard English and Singlish as two separate registers appropriate for specific contexts. Lessons were 1 hour per week, over 8 weeks, and were taught to two classes of 13-year-old Secondary One students. In the study, students were able to negotiate and contest the appropriateness of Singlish in specific situations, while deploying Singlish and Standard English features appropriately in written tasks (i.e., designing advertisements for various products). This suggests that Singlish can be a useful pedagogical resource in the development of critical language awareness (Alim, 2005), and that prevalent discourses surrounding the use of Singlish and Standard English by Singaporean students severely underestimate the proficiencies that they possess.