Yes, you heard wrong.
As a general point, if a person went crazy before confession, in order to stuff as many sins in as possible and then be forgiven for them, that behaviour would itself have to be confessed. The priest is hardly likely to approve of it. He would probably still give absolution, but might well advise the person not to do the same thing again. And he could make the penance fit the over indulgence in some way.
I think this comment might come from comments around Shrove Tuesday (aka Mardi Gras; it is the same day). Because Lent starts the next day, traditionally people eat up all the stuff in their larder that they can't eat during Lent. In England this translates to having pancakes to use up the eggs, milk and sugar. Hardly debauchery, really.
Shrove Tuesday is traditionally in England a day to go to confession; shrove is the past tense of shriven, which in turn means absolved of sin.
Catholics are obliged to go to confession at some point during Lent, but it doesn't have to be Shrove Tuesday; any day will do.
In case anyone is not familiar with the other days you mention here is a very brief summary. Ash Wednesday is the first day of Lent. On this day we go to church to begin the season of penitence, and we have an ash cross put on our foreheads by the priest, as an outward sign of repentance. Catholics leave the cross on for the rest of the day, others may not. I tend not to, because I don't like overt signs of my faith. Maybe next year I will leave it on, this year I didn't.
Maundy Thursday is the day before Good Friday. It commemorates the instigation of the Last Supper, which is the precursor for every Eucharist/Mass. It is a very important day, usually ending in a vigil until midnight, to remember the Lord in the Garden of Gethsemane before his arrest.
Good Friday is the day of the Crucifixion, and is the Friday immediately before Easter Sunday. Easter Saturday is the only day in the Christian year when Mass is not celebrated, because the Lord is in his tomb. Easter Sunday is the holiest day of the Christian year.