What is demo past tense?

The past tense of "demo" is "demoed" or "demo'd". It is an abbreviation of the word "demonstrated". The use of the past tense of "demo" implies that a demonstration or a presentation already took place in the past. For example, "Yesterday, I demoed a new product to our clients" means that the speaker already showed the product to the clients the day before. The past tense of "demo" is commonly used in business and technology contexts, particularly in software development and sales.