In Hessen, people often use the word "ger" at the end of sentences, as in **
"Danke ger!"
"Weißt du, ger!"
**
Definitely know it is an exclamatory expression. Is there any translation in English.
If you are talking about the word "gell" or "gelle" or "gä/ge" (which I presume you do, because I've never heard of "ger" here in Hessen):
The word "gell" and its regionally differently pronounced equivalents do not heave a real meaning. It is used to emphasize/indicate a question or ask for confirmation, very much like "right?", "isn't/doesn't it?", "don't you?", "eh?" in English.
Examples:
Du wohnst auch hier, gell?
You live here, too, right?Danke, gell?
Thanks! (I can't come up with a proper translation for this. Here, the "gell" is just appended to ask the other person to confirm they understood you thanked them)
Gä or ge or gell(e) is the same what you are hearing. I'm from Hessen. I say always gä but it sounds like ger. Maybe that confused you. Depends regional in Hessen: South Hessisch, Middle Hessisch, Nord Hessisch or Frankfurter Platt.