But our truffles are the most
Mad-magical in Amsterdam
(She won't, she won't)

from Lady Gaga – Mary Jane Holland Lyrics on Rap Genius

Meaning

Psychedelic “magic truffles” are sold in many shops in Amsterdam.

These truffles are chunks of the mycelium that grows underground beneath the “magic” mushrooms, and it can often contain just as much of the active drug, psilocybin, as the mushrooms that extend upwards from it.

The laws in the region ban only the mushrooms themselves and not the mycelium (truffles) which allows it to be sold legally in shops.

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