it means that someone gave you a child as a Christmas present. HAHAHAH JK. it means that he/she might be smarter than the average child and is blessed with great skills. Or exceeds his/her peers in some skill.
It depends on your interpretation of "gifted." When I was in school, to get into the gifted program you actually had to be tested by someone, then attended a special class on certain days of the week with more advanced stuff to "nurture" your gifted-ness. It also gives the parents leverage to get the kid into advanced classes or to attend the split-grade classes.