1. without thinking ahead (based on one's current status or situation)
Why don't we just make it up as we go?
To do something 'as you go along' means to improvise according to the situation. If you have no fixed plan other than to react to other things that happen, you 'make it up as you go along'. This can have a negative connotation - someone who has failed to plan or has failed to do any research before presenting a topic, for example, might be accused of 'making it up as they go along' - or a positive connotation, similar to the phrase 'go with the flow' (to be unrestricted by plans and willing to adapt to circumstances and needs that arise). This phrase could be used in professional or social contexts.