Gallaan Goodiyaan is a Punjabi phrase that means sweet talks. Gal in punjabi means talk, gallan being the plural, and goodiyaan comes from gooR/ gooD, jaggery, close to Hindi equivalent guR/ guD. So gallan goodiyaan means jaggery-like-sweet-talks.
Gallan goodiyaan is the title of a song from Dil Dhadakne Do, sung by Sukhwinder Singh, Shankar Mahadevan, Yashita Sharma, Manish Tipu, and Farhan Akhtar and written by Javed Akhtar to Shankar Ehsaan Loy's tune.