The question is ambiguous as it doesn't specify what "size" refers to. It could refer to height or penis size. Therefore, we will address both interpretations.
Interpretation 1: Height
Based on available data, Timor-Leste has the shortest average height for its male population, averaging 156.42 centimeters (5 feet, 1.6 inches). This makes it a strong contender for the answer to the question when referring to height. Other sources mention that several East and Southeast Asian countries tend to have smaller average heights compared to European countries, but precise data for comparison across all countries is not readily available in these references.
Interpretation 2: Penis Size
Several sources mention studies on penis size by country, but the provided text excerpts do not provide a definitive answer on which country has the smallest average penis size. The links provided reference studies and rankings, but the exact data is not explicitly included in the snippets. Therefore, a definitive answer cannot be provided based on the references given. The references do mention Cambodia, Burma, and Taiwan as having some of the smaller average erect penis lengths.