The 10 Funniest Sister Mugs That Will Make Her Laugh Out Loud
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Looking for a gift that says "I'm thinking of you" without being too serious?
Whether you're shopping for Sister's Day (first Sunday in August), her birthday, or just feel like being the good sibling this week, we've got you. These are the 10 funniest (and occasionally tear-jerking) sister mugs that will make her laugh—and maybe even text you back.
And yes, they beat a gift card. Easily.
1. "Never Trust a Sister" Mug
Perfect for: The one who'd absolutely rat you out—but still has your back.
"Never trust a sister who says she’s ready in five minutes."
This one's already a bestseller for a reason. It's funny, brutally honest, and weirdly relatable.
2. "Built-In Bestie" Mug
Perfect for: The sentimental one who still steals your clothes.
"Sister. Built-in Bestie."
Simple, warm, and actually sweet. A hug in mug form.
3. "I'd Commit a Class C Felony" Mug
Perfect for: The one who brings snacks to every meltdown.
"I’d commit a class C felony for you... if you bring snacks."
Equal parts touching and deranged. Like your sister.
4. "What Would My Sister Do?" Mug
Perfect for: The sister who gives great advice and slightly worse ideas.
A gold-toned design with just enough sarcasm and sass. WWMSD?
5. "I’d Fake an Alibi for You" Mug
Perfect for: Your favorite co-defendant.
"No questions asked."
Classic, clean, and criminally underrated.
6. "Favorite Sister" Mug
Perfect for: Starting fights at family dinner.
Loud and proud. Bonus points if you’re an only child.
7. "I Wish You Lived Next Door" Mug
Perfect for: Long-distance sisters and besties.
Sentimental but not cringe. It hits where it hurts.
8. "Call Sister" Emergency Mug
Perfect for: The one who talks you down off a ledge.
Looks like a fire alarm, feels like therapy.
9. "She’s Not My Therapist" Cat Mug
Perfect for: Sisters who overshare—and own pets.
A little dark. A lot funny.
10. "This Mug is a Hug From Me to You"
Perfect for: Sending a warm fuzzy that survives the dishwasher.
Classic cozy design. Zero emotional labor.
Want more Sister's Day ideas? Check out our guide to Sisters Day Gifts – Funny Mugs for Mildly Chaotic Love →
See the full board on Pinterest:
Sister Mug Gift Ideas – Pinterest Board →
Shop all Sister Mugs:
BuyTheMug.com Sister Mug Collection →
FAQ about Sister Mugs
When is Sister’s Day?
Sister’s Day is on the first Sunday in August (this year, August 3, 2025).
Are these mugs dishwasher safe?
Yes — all our sister mugs are microwave and dishwasher safe.
About the Author
Amber Casperi is Head of Gifting Neuroscience at Buy the Mug. She writes about emotional dysfunction, microwaveable beverages, and the art of saying “I love you” without making eye contact. She’s a former office worker, current mug hoarder, and has survived multiple Sister's Days. Her work has not been published in The New Yorker, but it absolutely should have been.