At university I often went to my aunt's for a free meal at the weekend.
Tips
usage
蹭 is 'to rub against', and colloquially 'to get something free by tagging along': 蹭饭 a meal, 蹭网 someone's Wi-Fi, 蹭车 a ride. Among friends it is a joke, not an insult. The two halves can be split: 蹭了一顿饭 'to scrounge a meal'.
