1. to add something unusually good or bad to a situation that is already difficult.
and to top it all off, it started to rain while I was locked out
'To top it all off' is a phrase that adds emphasis to storytelling or recounting of events, where something bad or unusual has occurred in addition to a number of other things which have already been part of a difficult or trying experience. This phrase usually has a negative connotation, as it is mainly used to describe unpleasant or sometimes humorous events. It is related to the phrase 'the icing on the cake' and can be used in a number of contexts.