This is the 12414th most frequent German word.
volltest
"Volltest" is not a standard German word; it may be a typo or a specific term/context-dependent.
Here, 'volltest' is the second-person past tense of the verb 'füllen', used in context showing someone filled a container.
Das Glas, das du volltest, ist jetzt übergelaufen.
The glass you filled is now overflowing.
In this sentence, 'volltest' illustrates the act of filling metaphorically, in an emotional context.
Du volltest das Herz des Kindes mit Freude.
You filled the child's heart with joy.
'Volltest' here indicates the completion of a task, opting for the use of the verb 'vollenden' in past tense.