This is the 10486th most frequent German word.
rammel
The German word "Rammel" is not commonly used as a standalone term, but it might relate to regional slang or derive from "rammeln," which colloquially refers to animals mating or, crudely, to sexual activity.
In this context, 'rammel' is used to describe the act of forcefully fitting or pushing something into a tight space, relating to its colloquial use to mean cramming or shoving.
Der Schrank war so voll, dass ich nur mit Mühe etwas hineinrammel konnte.
The cupboard was so full that I could only cram something in with effort.
Here, 'rammel' is part of the compound word 'rammelvoll', which is a colloquialism meaning very full or crowded.
Auf der Party war es so rammelvoll, dass man kaum atmen konnte.
At the party, it was so packed that one could hardly breathe.
In this context, 'rammeln' is used in a completely different sense, referring to the mating behavior of rabbits, which is a specific colloquial usage of the term.